Not sure why you're comparing Seguin to Eichel, you aren't defending a Seguin-for-Eichel trade. And Eichel isn't nearly as good as Draisaitl. Here's their past 3 years' scoring:
2. Draisaitl: 205, 121-171-292 [1.42 P/GP]
31. Eichel: 166, 66-112-178 [1.07 P/GP]
86. Seguin: 153, 52-80-132 [0.86 P/GP]
Draisaitl has scored nearly twice as many goals as Eichel, nearly twice as many P/GP as Seguin, has played more games than both and is on cheaper contract than both. There's no comparison here. Draisaitl >> Eichel >>> Seguin.
LOL, sure. He's never been good defensively, he's basically a PP specialist - the last thing Edmonton needs. I'll take Bear + Larsson + Bouchard on the right side all day, Klingberg isn't needed at all. He plays the 4th hardest comp in DAL and is underwater in terms of corsi and expected goals vs Elites. He has the worst even strength GF% and xGF% of ANY Dallas defender. No wonder you're desperate to get rid of him. #2 or #1, LOL!
4th
I see him, he just isn't enough to get Draisaitl and the other pieces are uninteresting. Draisaitl can and does play with McDavid and scores pretty well when he does. Puljujarvi has scored 14 goals in the past 40 games much of the time with McDavid - that's a 29-goal full season pace. That looks like a solution to me.