Yeah, I agree with the guys. Go with Megs. I didn't know this but if he is awakened, in raids bots who have repair modules, megatron can steal that buff.
Awaken the bot what you want to use later G1 Megatron and Primal has the sig that is important for the character but If you want to use Galvatron or Shocky later, awaken him. who do you want to use with what synergy. That's the question
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I find that I'm not really relying on the others sigs to play them