The Predator in P1 saw Dutch as a worthy enemy, but if the predator didn't, he would have dispatched Dutch with his Plasma Cannon, as for the predator in P2 it was the same, this time though if his Plasma Cannon wasn't disabled he would have dispatched Harrigan, and in AVP, they shoud've arrived to the temple with the cannons, rather than have to pick them up, so without the cannon the Predator can't win, well if he isn't unblooded he can win against anything, so it's a win-win situation, the Blooded Pred can win against cheif, but an unblooded pred can't win against cheif.