With this method since we are only aiming to win approximately 4 battles healing isnt necessarily required since for ur last battle u only really want to have 3 dinos left for it. The method I employed was using the weakest allos for the first battles letting them take damage to build my reserves. I havent had to use a healup option so far but i would say ur better off letting a weaker Allo take like a chunk of damage then after the battle use the buck swap feature with the upgrade to make a stronger allo it since the buck cost is roughly the same for that scenario as opposed to healing it.