I have a lot of experience with using the 3-2 zone. And the part you say about a weak link and 3-2 zone is very risky. "A zone defense is only as strong as its weakest link."
If you have a weak perimeter defender and use the 3-2 zone with him in it your opponent will slowly adapt and run their offense through him. And you have no control over who shoots against him either.
This is something I have seen so many times in games.
The best thing you can do is to scout your opponent really well and put your poor defender against their weakest scorer in m2m.
That's very true in theory, and often in practice. Of course, sometimes a zone (say, 1-3-1) ends up having the weak point (say, a 8k SF in relatively poor GS) match up frequently against guys who are in the PG/SG positions (both over 108 PP100 projected) and give up a total of 1 basket on 10 shots by those players (1-7 from beyond the arc).
(90486335)Really, going against outside offenses is just a crapshoot. Quite often, players expected to put up more than a point per shot end up 3-17 or some such, and much less often, guys expected to have mediocre days go ape and end up like 8-9 from three. I suppose I should spend some time trying to figure out why that is, but I'm too busy trying to figure out how to make my team have bad enough flow and inside shooting to decide to jack up threes more often, since we shoot 5% better from outside than inside.