Carry on with your logic and there is no point comparing players at all as there will always be variables? Maybe worth looking at their individual stats? I can't upload the screen shots but Collins is the best of the 3 overall.
I was only applying your own logic of selective ommision of Wilsons best season previously as it wasn't comparable in your view
But now you want to include his worst period in the team to compare with Dovin, even though it isn't comparable for the same reasons as you dismissed his best season.
If you want to compare Wilson of 20 matches last season to Dovin 20 matches this season then playing a different formation is a significant factor, particularly when the stats you shown earlier were showing total wins and total clean sheets which would be significantly affected by the system and other 10 other outfield players. (Which you presumably agree with as you are reluctant to give much credit to Wilson for all the matches won and clean sheets in the play off season)
Things like save % and expected goals prevented would give a better comparison, and the good thing about those is you can compare both players 'best' seasons as this will be less skewed by other variables and outfield players.