Did Claremont ever even use Bobby in his original run? I'm almost through reading all of it and I can't recall that he did.
Claremont used Cyclops from the start,
he used Angel every now and then,
he completely overhauled Jean when he picked her up,
Beast showed up like twice in his Uncanny X-Men,
but unless that happened in some Annual and discounting all the O5 robot clones at the start of the run, I'm not even sure if the Claremont team ever actually met him at all.
Basically from where I'm standing it seems to me like even Claremont during his heyday seemed to think Iceman had nothing to add to the franchise.