I'd be interested in seeing KG defend Lebron. His size and length could pose problems for LBJ like he never really sees. KG could sag a bit more than most since he could recover to contest the jumper, and I think in that situation KG would be able to defend him pretty well.
But can Gortat defend Bosh?
In all liklihood, the C's would simply zone up.
Doesn't anyone else remember our best defense against the Heat being the zone? With two seven footers to defend the paint, we turn Miami into jumpshooting team and even more effectively than we did last year. Their shots get taken away from the basket while we pound the ball down low and have Gortat and Garnett shoot straight over their defenders. That plus the fact that the rebound battle is ours for the taking gives us a better chance to win than having ANOTHER body to throw at Wade when Lee, Rondo and Barbosa should be more than capable of limiting him enough.
I keep saying it but what Bradley brings to the table is not going to be enough to change the makeup of this team. We're either title ready now with Bradley giving us a slightly stronger edge in dribble penetration (and that's really the only BIG plus he brings that we cant get from our other guards) OR we aren't title ready and need to make a big improvement to our rebounding and interior presence and thus the need for a player like Gortat to take this team from where it is now to being title ready.
If you honestly believe we are title ready as constructed, more power to you but when I see us give up so many 2nd chance points while getting none for ourselves, my mind thinks different.
The zone defense was very effective against Miami when they were playing with two big men (Bosh + Haslem/Anthony/whoever) ... it won't be anywhere near as useful now that Miami has gone small and has spaced out the floor with multiple shooters.
Miami is not jumpshooting their way to a title. Sorry, it just ain't happening. High percentage basketball necessitates scoring points in the paint. I'll take two guys shooting 4 feet away from the basket over smaller defenders every day to a bunch of shooting specialist taking shots 20+ feet away from the basket over guards who can play good defense. The point of the game is to keep them away from the rack and that's what inside presence is for plus it makes 2nd chance points far less likely as the only rebounds they should be getting are the long ones.
Their shooters get a lot of drive-and-kick opportunities. If the Stay-Puft Marshmallow Man is protecting the rim, they can make havoc by forcing help and switches that leave someone open. Their passing right now is incredibly improved, so that's a problem. Zone makes more sense now than it used to.
Bradley's advantage/strength is protecting dribble penetration on the perimeter, but he can only guard one guy, and that guy can't be Lebron.
Gortat's advantage is his size and skill in the middle. He's not made of Marshmallow.
I think the best shot is to go big and long to control the boards and passing lanes. That's what would make them jumpshooters. We'd have to be able to switch all screens, pack the middle, trap, and cut off the reverse pass to the weak side. A zone should accomplish that, and is really the only shot (since their individual players are generally better than any other individual opposing player).
Bradley and Gortat would really both be key pieces in making that happen.
In a forced-choice scenario such as the OP presents, I trade small for big 10 of 10 times, but as much as I'm high on Sully, I'd try to send him with a pick and matching $$ and keep Bradley.