Zekrom is great late game. I split 2/2 now, and it's doing alright...so far. I still think Thundurus is a nice starter because it helps get you those Energy in the discard pile. Sometimes Sage's is inconsistent, so skipping on the Thundurus isn't the best idea. But it's still personal haha.
EDIT: Just finished another game and YES. Zekrom is your HOMIE in Eelzone.
EDIT: Just finished another game and YES. Zekrom is your HOMIE in Eelzone.