Of course Cohon was more polished with the media; his background and business acumen are totally different than Ambrosie's. Bit of a tough comparison to make between the two, IMO. Same goes for a comparison between Ambrosie and his predecessor, Jeffrey Orridge. Of the three, I'd say Cohon had the most success during his tenure, his biggest feats being a lucrative TV deal and the expansion into Ottawa. His tenure was the also longest, at least to this point in time.
I have to disagree completely with your point on attendance. Official figures are difficult to find when it comes to this ridiculously secretive league but cfldb.ca is pretty reliable as a resource. Let's be honest: it isn't like attendance was phenomenal league-wide prior to Ambrosie taking the reins as commissioner. Attendance has been a major topic of discussion for years with the CFL, with attendance figures having declined consistently for several seasons, as far back as when Cohon* was commissioner.
Here's the attendance average per season and the difference compared to the previous season (I've eliminated the decimal):
2012: https://stats.cfldb.ca/league/cfl/attendance/2012/ (28,190 / +423) [this was the last time an increase in attended has occurred]
2013: https://stats.cfldb.ca/league/cfl/attendance/2013/ (27,006 / -1,184) [substantial decrease despite the inaugural season at IGF]
2014: https://stats.cfldb.ca/league/cfl/attendance/2014/ (25,286 / -1,720) [this is noteworthy considering it was Ottawa's inaugural season]
2015: https://stats.cfldb.ca/league/cfl/attendance/2015/ (24,733 / -553)
2016: https://stats.cfldb.ca/league/cfl/attendance/2016/ (24,692 / -41)
2017: https://stats.cfldb.ca/league/cfl/attendance/2017/ (24,644 / -48)
2018: https://stats.cfldb.ca/league/cfl/attendance/2018/ (23,855 / -789)
2019: https://stats.cfldb.ca/league/cfl/attendance/2019/ (22,916 / -939)
Seven consecutive seasons of decline. Three commissioners.
It's worth noting this trend has affected most professional sports, if not all of them. Unfortunately, the CFL relies heavily on its gate-driven revenue, so that throws a wrench into things more than any other professional league on the continent. Compared to sports heavyweights like the NFL and MLB, the CFL is essentially a featherweight when it comes to its financial footprint. If you're going to claim Ambrosie is solely responsible for attendance dropping across the CFL, you should be prepared to substantiate that with credible data.
And the CFL's lost season isn't just on him. There is ample blame to be spread around here for how this whole debacle unfolded. I will say his somewhat ham-fisted attempt to get federal financial support is on him to a point but there's a reason this league has executives and they also seemed to do **** all to help things along. A single individual does not make or break a sports league and it's going to take more than just a commissioner to get the league back on the right track. I think you're being overly harsh with your criticism and the claim the CFL "needs a fresh face for a new start" is an exaggeration, especially when you consider why the league didn't operate this year. You seem to have some personal issue with Ambrosie and it's hindering your ability to look at this situation through a lens of objectivity.
* it's hardly a relevant point but it does show that attendance issues have dogged this league for some time regardless of who has the title of CFL Commissioner