Butchers not wearing armor fits fluffwise and isn't a huge concession to balance. I think the 'weapons and wargear' was intended to reflect that.
Young guts were moved to henchmen to allow for lads got talent rolls not being wasted advancement rolls from the very beginning. The gnoblar hero was intended to support early growth and provide at least one cheap hero option (also supports lads got talent). Both still feel ugly and unogrey, but we (or at least I) didn't want to start writing exceptions to every rule.
I'm still think the hero distribution should be 0-1 captain, 0-1 butcher, 0-3 maneaters, 0-1 snarefinger. Giving us a max of 6 hero units. As it stands we could have 8 heroes (6 ogre cap and then 2 snarefingers) which is more than even the skaven get. Having us cap at 6 heroes 6 henchmen feels right to me (bigger than average on heroes, less total models)
as for bone cruncher, I think its caster picks, but may be more balanced with a random selection...