@ippigyeah, it stacks up fast. Of course you don't get it till already at Master but good way to farm prize bulbs for the future, if it's not nerfed.
Couple more things as I had just popped back on to check Rux and get the dailies done.
You can be overhealed as a co-star. I'm not really surprised, but I have confirmation as an AI scientist did that in a battle chest event.
I found a weird bug that I think I saw someone else report earlier. I went to co-star a teammate and I was on the ground as the co-star and able to drive myself and play independent of my target host. I'm not sure how to repeat it as it's only happened once so far. Something to be fixed in future.