I feel that the 1 free revive for the passive is unnecessary and feels out of place with the theme of Warframe. Also, instead of the passive being given to allies, the 1st ability should be shared between your teammates.
Ability 1 feels fine and I think this is a great change.
Ability 2 feels ok, but I think it should be that ALL damage for YOU only (so it stops Oberon from sabotaging other ppls’ builds).
Ability 3 is also fine, as you say doesn’t need much change.
Ability 4 is great, but maybe along with the health bonuses it should give someone more. I’m not sure what, but I feel that just HP is not much. Maybe instead of HP it should give over