Killing DT first is not a good idea since krennic can revive him. Both of them must be saved for last.
That's why Krennic needs to be ability blocked or it's over and I get it, that's total RNG. It'll be almost impossible to kill Krennic with DT present. DT removes all buffs and does massive damage with Krennic alive and debuffed characters, which TFP can do on the first turn. If Krennic staggers the droids, he calls DT to hit one of them which removes 100% TM, then if you have Vader follow-up with his AOE to hit remaining staggers, the remaining 4 lose TM and now they're likely slowed too. Droids will not recover from that. I think droids can possibly do it but they need favorable RNG and JE must be faster than TFP.
