I would disagree, these days it is easier than ever (especially with an abundance of reputable online retailers) to get pure quality (f1, f2, etc..) mbuna, even wild caught, without having to worry of its bloodline. Unless of course you're shopping at big chain retailers with their "assorted" variety.
I would agree if it were new wild fish and/or f1 etc.
I doubt anyone who would breed such common mbuna which isnt worth much (We used, going back 20+ yrs as such soi called common fish nowdays were just coming into the hobby). Most fish pic above seemed to commonly avail fish thru farms/local breeders and if it were, I would doubt of their purity of their. Dont take me wrong, they all are beauties.
All the breeders and /or transhippers that I was associated with would not breed such common fish unless same sp but from new locations (another word, other morphs, subspecies, new species, etc) or start a fish farm in Florida as one did for common fish..
On the other hand, we would tempt to breed any new wild species as soon as fish becomes avail, even way before avail to most hobbyist.
If I remember correctly, most lfs would carry fish which are avail in quantity thus cheaper. I used to know one or two lfs and few breeders who did nothing but rare specimen but most of them are not into it anymore.
I dont do specific breeding anymore but few of my former colleagues are still in wholesale trade.
Regardless, they are all beauties!
Oh!, Pardon me for keep editing, My fingers are nort as fast as they used to be.
If above fish were from specific breeders, I am sure original poster would know what they are OR maybe he has start another ID game. Just a thought.