I'll enter with my first post here and answer based on the level I view the bidding and play so far. At my level I often see the bidding being a little optimistic which colours this post. We know RHO raised with 3 card support, so it wasn't on length. LHO overcalled with either AKxxx or next best K9xxx. I'm giving RHO the AK and they have the QD. An AK9xx overcall is not going to be the last bid so is not that bad, but 3S may be, and it risks a push to game. Thus I think 3S both needs to have points to come close and plans on defeating 4H. Neither may be true and the lack of agreement of 3S and signals as they are don't change these assumptions. I think the ops have both taken an over-optimistic view - LHO at the 1 level, and RHO due to points and potential defence. The QH is then with RHO and LHO may be void but too weak to dbl with 5S. But since we have already ruffed a C the 4-0 split doesn't matter any more.