Phelan M. Ebenhack/Associated Press

There have been many so-called rock-bottom moments for Indianapolis Colts leadership throughout this 2015 season, but Sunday's unfathomable loss in Jacksonville may be the final straw that breaks the camel's back.

Anything can happen in the NFL on any given Sunday, but the Colts' 51-16 loss to the Jaguars—yes, you read that right—is a sign of much more than just a difference in execution and game-planning.

Simply put, this front office and coaching staff haven't put together a team capable of handling adversity. Too many signs of regression have shown throughout 2015 to ignore for a team that had made strides for three straight seasons before this one.

They may have been without the all-important Andrew Luck for this recent stretch, but their problems are rooted well beyond their star quarterback. Shortcomings that would derail any team—from an inept offensive line to shoddy passing defense—are making tough games virtually impossible to win, whether or not Luck is playing at all.

Only two teams have allowed more passing yards per game than Indianapolis' 280.4 and the 24 scores given up through the air is tied for fifth-worst in the league. Jaguars quarterback Blake Bortles added to those numbers with a trio of touchdown throws, but it was the running game that gashed Indy the worst.

Phelan M. Ebenhack/Associated Press

Jaguars running backs Denard Robinson and T.J. Yeldon—not exactly one of the league's most feared backfield duos—combined for a big day, taking a combined 25 carries for 137 yards and constantly pounding the Colts' once-feared front.

Simply getting outplayed by Jacksonville is bad enough, but the way it happened was all the more embarrassing. After looking in control of the game late in the first half, the Colts simply fell apart and saw the Jags go on an incredible 48-3 run that caught the eye of the Indianapolis Star's Gregg Doyel:

With that in mind, the Colts had their chances as told by their 322 total yards of offense. But the game was decided in the red zone, where the Jaguars converted all four of their trips into touchdowns.

As for Indianapolis, it went 0-of-3 on its red-zone trips and wide receiver T.Y. Hilton made no mistake that those struggles are a fatal flaw as of late, per Kevin Bowen of Colts.com:

When a team dominate its division with 16 straight victories over a span of three seasons, only to follow it up with a loss in this fashion, it's pretty obvious that there's a major disconnect somewhere between the players and coaches.

Of course, you don't have to go back far to find a similar type of lifeless outing. In fact, just look back to last Sunday night, a similarly embarrassing 45-10 defeat to the Pittsburgh Steelers.

Luck may be the league's best young quarterback and one of the best in the game. But losing two games by a combined 70 points all but closes the argument of whether the 26-year-old's impending return in Week 15 or 16 will be enough to help save this Colts season.

With or without Luck, those around him have shown little to indicate they can collectively make another run to the AFC title game. Any Colts quarterback has been under duress in front of a horrid offensive line, the defense has been hapless and even the receiving weapons that general manager Ryan Grigson invested so many early draft picks into aren't doing their jobs.

Put all of those dynamics together, and you have a front office that should quite obviously be axed by the end of this wretched season, per Collin McCollough of Bleacher Report:

Constant shortcomings from Grigson's front office and head coach Chuck Pagano's staff have put these Colts in a position where they're 6-7 and rooting for the New England Patriots—gasp—to beat the Houston Texans in order to stay atop the AFC South. Of course, following that will be a matchup with those same Texans.

Whether Luck or backup quarterback Matt Hasselbeck can get enough help to make something of this peculiar late-season situation doesn't really matter at this point. Playoffs or no playoffs, the distance between the Colts and the AFC's top teams is too wide for it to make a real difference.

It's been a prove-it season all throughout 2015 for the Colts, and all they have proven throughout 13 games is that they're more reliant on their franchise quarterback than ever before. And after this group gets a couple more games this season to ask the world of Luck without much help, it should be another coach and GM's turn.