Nothing in his past? He has exactly 2 years experience as a HC in his past, both winning seasons. You're reaching dude.
Edited to add: I looked back at what Collins "had" in 2017 and 2018. According to the 247sports team talent composite, he had the #76 overall talent in 2017, and #82 in 2018. For comparison Matt Rhule had #85 in 2015 and #71 in 2016. Not that much difference in overall, but let's look at their opponents. I gave a +/- 10 in talent since there are so many college teams, and teams within 10 spots of each other talent wise should be competitive.
In 2015 they were #85. 6 of their 13 opponents were better than #75.
In 2016 they were #71. 3 of their 13 opponents were better than #61.
In 2017 they were #76. 4 of their 12 opponents were better than #66.
In 2018 they were #82. 8 of their 12 opponents were better than #72.
In years 2016, 2017, and 2018 they lost 2 games to teams with worse talent rankings than them. One of those losses each year was to a team rated #132 or higher. What does all of that mean? Basically the only year that Rhule overachieved was 2015. Other than that, he and CGC both beat most of the teams they should, lost to most of the teams they should, and lost a couple they shouldn't. Yes Rhule had a conference championship in 2016 but CGC was 7-1 in AAC in 2018 with only loss to undefeated UCF. Had he had the opportunity to play in a conference championship he may have gotten 9 wins. Rhule didn't win the only bowl he coached, CGC did.