the way i see it is alloran go screwed. like he didnt do the things he did to be a mallicious person. the way he was seeing it was kill a few, save a million type thing, which is what the animorphs did pretty much the whole series. if he managed to stop the invasion of the hork bajir, they woulda had a huge advantage over the yeerks. but it was the wrong way to go about it. he shoulda just listened to aldrea the 1rst time she called them about it.
and with him wanting to kill those yeerks in the andalite chronicles, think of it this way. there were what, lets say 2,000 yeerks there? that would have been 2,000 less hosts and 2,000 more free ppl (aliens whatever) had alloran succeeded.
moral of the story, alloran didnt deserve being visser 3