The only numbers that count is whether or not you out score your opponents. Getting more rebounds is one thing that helps but if you aren't doing the other things you need to do to out score your opponents you will lose. It is is as simple as that.
Since you seem to be hung up on the rebounds.
Please tell us all.
1. How many rebounds less per game the Raptors will get if Evans comes off the bench rather than starts.
2. Than translate those rebounds into points.
3. Then factor in all of the other things that other players can do better than him against the extra points he gets because of his rebounding as as starter.
I would love to see you calculations.
The only numbers that count are the points that your teams scores vs the points that your opponents score. Saying that Raptors would be worse without him starting not only can't be proven but is wrong in my opinion.
The Raptors were 3 - 0 last season against lottery teams with this starting lineup.
Do you really think that Turk last season was that much better than Kleiza?