Hamata x something has a loss of the extreme peristome. Hamata x something x hamata (or maybe 1 more hamata cross and from then on) will look like a hamata.
Well those platychilas sure "looked" like platychilas, superficially at least, didn't they? All I'm saying is if the seed grown hamatas are from the same batch (which there is a very high likelihood of that being the case), some of them are definitely hybrids. However, Rob said they were "clearly" hybrids, so he may well have picked them out, in which case there'd be a 0% chance of you getting an obvious hybrid, though as aforementioned, an introgressed hybrid is certainly possible, though I have no idea how probable. Like I've said in other forums though, there comes a point where one has to say "so what?", and call it the real thing anyway. For me, if it walks like a duck and talks like a duck...you get the idea.If the seed grown hamata looks like a hamata, is it not a hamata?
Why does it matter if that bical hybrid you saw was a backcross? How else would you strengthen the expression of whatever trait you were looking for that was only in one of the parents?
Anyway, for $150, I'd much rather have a jamban . Not that I can grow any of that stuff anyway....