It's also worth noting that it's very possible to go through pro mode without choosing specific weapons and upgrades, and without doing tricks like doing the el gigante path + backtracking to the ganado path. I personally think it's more fun to improvise as you go along and use weapons you think are fun to use instead of planning it out in detail to be super efficient.
As an example, this was my inventory when doing the final chapter on Pro difficulty:
That inventory is kinda overkill. And I wasn't even trying to stockpile stuff, it just happened. Actually, as a little minirant, I think this has always been a major balancing problem with all of the RE games. After some hours of play, unless you really suck at the game, you'll end up carrying a ton of weapons and ammo. RE5 probably suffers from this problem the least since you're limited to 9 slots without restarting a checkpoint (then again, it has another HUGE problem that you're always forced to play new game+ after completing it once). Other games like RE4 or the classic ones gives you access to a massive inventory which is never far from your reach.