Wheaten x Wheaten = 100% wheaten
Blue Wheaten x Wheaten = 50% wheaten and 50% blue wheaten
If the goal is to produce more blue wheaten, then I would be looking at those two cockerels and evaluating them for type, comb, ear lobe, clean blue breast and slate legs. The best would go in with the hens to produce a batch of chicks.
If you are looking to improve/develop your line of birds I would compare the three cocks for type, comb, ear lobe color, clean breast color and slate legs. The best would then go in with the hens for line improvement.
Consider doing both. Most of us have started with what we had and moved forward from there.
Michael