Don't get me wrong: I think Bird was fantastic, and yes, he was superior to Coltrane in terms of "sheer virtuosity." Also, be-bop is perhaps my favorite jazz form. So major props to Birdman (and his early partner Diz). I guess what I meant by "conventional" arrangements is that Bird, for all his skill, stayed pretty much inside the form that he helped to establish. Of course he died young, so who knows what he would have done in the 1960s. But Coltrane, first with the Quartet, then after, incorporated various pieces of world music in his arrangements, bits from the Arab and Indian experience, and so on. As he prolonged his compositions, he also stripped away the traditional sax notes common to modern jazz and unveiled truly raw, piercing sounds. In the end, though, it is useless to compare Bird and Coltrane. Both were giants, and each offered a unique sound.
DP