According to FFI, you are right Roppa440. The strut is responsible for holding the lower control arm in place when using poly bushings. If it is not set right the arm can slide back and forth on the bushing during braking and cornering. They have seen up to 3/8" gap at the K-frame to LCA juncture.
As far as rubber holding the bushing/arm in place, the same thing, but not immediately notable. The strut length is critical as HP2 pointed out and a bind can occur which works against the control arm causing premature wear on the bushing. Also the suspension maybe noticeably harsh.
Adjustable strut rods were recommended if there is a question as to the proper fitment. I plan to check things out and adjust the poly (strut) bushing if needed. Oh, and my control arms were checked and declared straight.
