Well in my opinion,the gist is he "chooses" Pym as "the Scientist Supreme" and overcomes Pym's own objections by claiming that Reed is "the explorer" and Stark is "the engineer" (when he isn't lobotomizing himself in INVINCIBLE IRON MAN), but Pym is apparently "the mage" of science, bringing it closer to magic than the others. I suppose that means that while Reed might be smarter, and Stark better at building things, Pym is the one with the artistic imagination (and as many artists are, has some emotional "quirks" to himself; I mean look at Van Gough). Considering many comic book scientists overlap and do whatever the plot desires, I thought this was a good way to single Pym out as distinct without stepping on the toes of the other two. It also ties into past issues of the run, especially the first few when Pym feels lowly compared to Iron Man as well as uses his science against the magic of Chthon.