He doesn't have to LET him do anything. There are 2 men in the ring. If Brewster is determined to get inside, I think he certainly can. If holding was the solution to stopping a fighter from landing punches on the inside, every fighter would do it. There are ways around it, and if Brewster is smart, he is training to deter it.
If it was a war based on respective IQ's I imagine Dr. Wlad would knock out Brewster and most other American heavies at the first bell :yep
And then some, all these posters that are coming out of the wood work, tell you one thing--they are scared! And they are looking for other "scared" posters to bolster them. The will not sleep well Saturday nite.
This is really a toss up, if Wlad stays on the outside and jabs he will win by UD. If Brewster mixes it up on the inside he wins by KO.
If outsmarting Wlad is the key to beating him.....well then he has been outsmarted by Brewster before. You aren't exactly making a point now are you.