RE: Need bow help for my dad
Good quality modern bows tend to produce a much faster arrow, so what he's sacrificed in draw ability can be compensated for with the inherent speed.
A single-cam design will probably be nicer to draw, and focus on the 80% let-off models.
Earlier this week I shot a Diamond Liberty -- if you want a suggestion for the "try this one out" list, add that one! they're affordable, too.