Where do you get that 2 number? Chapter 15 in in 54 states "Terrorists had begun to attack Andalite tourists and free Hork-Bajir. And the Andalites had agreed to make a single morphing cube available, on condition that it remain in Andalite custody and be used only for antiterror forces."
They Ax four went wrapping up negations, but we don't know what he did with them. Points far as we know one cube is enough for everyone.
More on track, to counter your thesis with a similar argument, what's a Yeerk's incentive to play on as nothlit spies?
We're taught Yeerks do what they do for a host. Plenty are washed in empire propaganda, but if you gave one this strong body, made it incapable of returning to the pools, really, why would he stick his neck out for an empire he can't really go back too? You can argue Andalites won't accept him, but they're no more likely to kill him if he choose to turncoat on the Yeerks than the Council would be.
Seems shaky to me
There's one major counterargument to your (otherwise good) points. The Yeerks hate the Andalites. Hate hate hate. Now, sure, it's fully possible that a Yeerk would overcome this as he/she became an Andalite
nothlit and fall in love with Andalite culture etc etc it does happen in human history. But will these hand-picked Yeerk spys really succumb so quickly? No Andalite war-hero, whether real or "yeerk-produced" would be allowed to just retire in the middle of a militaristic culture at war.
There will be no running along the family scoops, playing with children, engaging in pop culture, making Andalite babies or whatever (a la Edriss). The Yeerk spy will constantly be called on to kill kill kill his fellow Yeerks until his dying breath. So yes, even without Kandrona, I think any Yeerk-Andalite would stay loyal.
Besides, let's presume I'm dead wrong on that. If the Yeerk decided to betray the Empire, would they be able to parlay with the Andalite military and tell them the whole truth? They would be labelled an Abomination. A yeerk with the stolen
nothlit body of a dead Andalite. So any Yeerkdalite that decides to give up on his Yeerk brothers would have to keep his head down and
his mouth shut quiet. So even if you have 50 Yeerkdalite spies and 20 of them defect to the Andalite side, no one is going to be the wiser. Those thirty Princes or Captains or whatever are going to wreck some major havoc.