Which hybrid tank set up?

I skipped over season 3 & 4 when I took over my current account just before it entered S5 so I missed the evolution of the hybrid squads. I kept meaning to try some out, but Scarlett, Adam, & Lucius would've all taken too much of everything to get them up to snuff but this hero day I figured would be a good time before S6.

I was about to get Stetmann's EW to level 20 (currently 18), but since I see some people take him off to add Lucius I figured I should double check before using the shards if Stet may end up on the bench.

Or I could put the shards into Adam & try Adam + Scarlett.

I have just over 740k skill medals & \~ 300 EW shards

There's my current squad & current skills for Luci, Adam, & Scarlett. Luci & Adam EW's are both level 1.

Recommendations?