He would definitely use the Time Matrix sooner or later if he lived... probably no Animorphs... since he would make the Andalite fleet even more prepared, thus winning the war on Earth before Jake, Cassie, Tobias, Rachel, and Marco would even notice.
Marco would never see his mother again.
Rachel would never be the dark killer.
Tobias would never know his family and never get any friends.
Cassie would still love animals (and Jake).
And Jake might prolly lose his brother, but still become an average everyday person.
But Aximili would still be the inferior little brother...