agree he looks blue barred.
yes, 50% bare necks with the red girl. yep 25% him with any big bow ties. yep, big bow tie or no naked neck(aka culls...
) with non NN.
hard to tell just how much diversity... if he is not pure for what makes his body solid black, then yes a very wide range of colors- in this scenario will get black, blue, barred, blue barred and if he is not pure for silver gene, can get b/w like the bare neck b/w boy, reds like the girl, red barred....also unusual color combos such as blue tailed red/buff, blue tailed with barring plus "delaware"- b/w body with barred tail. the chicks will have both rose and single combs. he does not seem to be pure for barring, so half of the chicks will be barred, others not.
if he is pure for the silver gene, there will be no reds. only blues, blacks with and without barring.. maybe some black and white birds.
but if he is pure for "black", then all chicks will be black, blue, blue barred or barred and when they are mature, some will show either white or brown 'lacing' on them also the pyle zones probably will be white or red on roosters.
No problem at all, very happy to see people wanting to learn and experiment. He will add blue and also solid/mostly black to the EE. but from your album, there's already blue in your EE girls. they're the ones with grey tails and details on neck/body and one girl seems possibly a splash- the one with white on her neck, assume her tail is blue/white also.
Navas blues and splash are due to the blue gene on a genetically solid black chicken. blue gene has a big effect on black pigments but has a very minimum effect on gold series pigments. so your blue ee only have the blue color on the tails, necks and anywhere it would have been black if it were not for the blue gene being present. compare these with the ee with 'normal' black details on body.
your blue barred rooster is genetically a solid black chicken, with both blue and barring genes 'added on top' if it makes sense. he will throw nearly solid black and blue with the EE, and splash too, if any of the EE girls happen to have blue or splash.
he has a rose comb so some of the ee crosses will have walnut combs. they';re genetically a combination of rose and pea.