I hope this doesn't get laughed at but you do not need trout for a good swimbait bite. I actually do better with hudds in the standard trout pattern in places where there are zero trout native or stocked. Also I do better with the trout baits in muddy water than clear.
I also do not think trout are necessary for giant fish. I believe a strong supply of crayfish is the key in terms of forage. I have caught fish from trout stocked waters with the red lips, beat up mouths,some even bleeding, why wouldn't they be eating smooth, soft trout?
While saying this I do fish clear, stocked trout water, mainly because I enjoy numerous followers and pain in general, along with the shot at top end fish.