I'd also wager there would be plenty of full thumb over the top crimping going on rather than any of that half crimp nonsense.
Any perceived strength differences are going to be measured on a finger board anyway as the real world mostly forces you into doing something a certain way. Also I think the problem with 3 open to 4 half comparison is how do you define failure ? 3 open is fairly easy - you fall of after emitting 3-8 seconds of kung foo sounds but on a half crimp you start to loose form so probably let go before total failure.
Alls i'm saying is i'm def stronger open handed on a fingerboard.
