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Looks like they may use Hoover's Hatchery, which has an Olive Egger that uses Legbars and Welsummers - I think you hit the nail on the head :)

All I can find online for "Blue Tint Wyandotte" seems to refer to what is actually called "Blue Laced Wyandotte", and I can say with certainty that is not what the chicken in your picture is :) My guess is there was a mix-up, maybe someone put the wrong chicken back in that bin? Once she starts...

Could be cream legbar, could be a cross. There are also other breeds like Icelandics that have crests, but those usually aren't sold in retail type places. Where did you buy your birds?