The Indianapolis Colts were supposed to be Super Bowl contenders this season. Fresh off a 10-6 campaign where they reached the AFC Divisional Round, the Colts had an extremely bright future given significant improvements made to the offensive line and a defensive unit that proved to be extremely staunch against the run last year.

At the center of it all was quarterback Andrew Luck, who had finally made a healthy return to post one of his finest seasons as a professional. Flanked by a developing running game anchored by Marlon Mack and a line that could finally give him pass protection, things seemed to be looking up for Luck.

However, he stunned the franchise by announcing his decision to retire just over two weeks before the start of the regular season. Despite Luck's retirement marking a potentially crippling blow, the Colts have started the season 2-1 behind an impressive run of games from Jacoby Brissett, who has proven that he can fill Luck's shoes.

With the Raiders heading to Indianapolis on Sunday, Oakland head coach Jon Gruden gave his thoughts on Indy's resilience:

Brissett threw for 310 yards and a pair of scores during the Colts' 27-24 win over the Atlanta Falcons on Sunday, and he ranks seventh in the NFL in completion percentage (71.7) and sixth in passer rating (112.0).

The transition for Brissett has been that much easier given the strength of the offensive line as well as a healthy dose of Mack. Through the first three games, Mack leads the NFL with 61 rushing attempts, and he is averaging close to 100 yards per game.

Gruden and the Raiders have started 1-2 after defeating the Denver Broncos in their season opener. Of course, he alludes to their own preseason drama, which saw the team eventually part ways with star wide receiver Antonio Brown.