You "hope[d] that would be the case" or you hope that will be the case this year?
I mean it's still a possibility that he'll come back 3 weeks from now, for example. His sprain looked really minor. The fact that it's grade 2 confirms that, and 4 weeks is on the mid to high end for recovery time for a grade 2 sprain.
There's really no telling how long it'll take Tony to get back into playoff shape once he comes back. Maybe he'll take the full 4 weeks to come back, and maybe this will be his downfall in the playoffs because he's unable to get back to form quickly enough.
Maybe he'll come back somewhat prematurely (3 weeks), but he'll re-aggravate his ankle as a direct result of coming back too soon. Maybe he comes back early and we end up winning a championship because he has sufficient time to get back into "playoff shape" by coming back a week early.
The permutations are endless and it's impossible to predict, which is why Pop simply errs on conservative side for resting/recovery time for any kind of injury. At the very least you know you're decreasing the probability of re-aggravation with more rest.