Sumo is not spammable. Sumo is not a support unit. Sumo is an expensive assault unit.
If there was a mobile version of newton that hovered (let's call it a Ramiel) that cost the same as a newton (220 metal) then that would be very OP, as it would be able to literally push the enemy front line back.
Maybe mobile Newton could be a hover factory unit?
I think Jumpy could thematically fit a new unit, call it the (Linebacker? Bouncer?) that has a 4 second reloadtime on a uber-high-impulse melee attack with a 45* arc in front of it that is pushed, enough impulse to make a zues bounce backwards and make a small group of glaives fly to their deaths.