[illegit]

Using a big stack and potting preflop and most flops is knowing what you're doing. This strategy seems to work even better in Omaha where most players are constantly nutpeddling. Personally I'd need a read on just how aggressive he's been playing. There's a difference between betting the flop and RAISING on the flop. The fact that he raised you looks more legitimate. Unless he's made a habit of raising on the flop.