Picking up on Alloran again; I do think that he may have had an affect on him but I gotta say; first: the best scientific mind in the world may be a poor stategestist, and vice versa; I don't see Elfangor figuring out a extra dimensonal matrix first shows that the yeerk is any less sharp in tactics.
Also I don't like making out Alloran this crazy. He was ruthless yeah, but lets not forget that he was a leader too; and though he may have been shamed, he still never lost rank.
Part of what made V3 such a threat was that this was two cunning minds, and each carrying their own amount of cruelty, in one head.
The yeerk and the andalite both had their highs and lows before and after he were infested, I don't think it's proper to say Alloran was mad and inflicted the visser with it though