The spell has been in previous expansions yes. However every new expansion meets a new criteria. Burst is changed, healing done is changed. So reintroducing a spell in a completely different forumlated meta is yes quite shocking. Not forgotten, just needs tuning to the current design.
4 interupts to be exact with deathgrip.
I have no problem with DK damage. Necro strike is not damage, as it doesnt change your health bar. Its an absorb of healing which needs tuning.
My exact point in regards to moving away from a game where people are going into arena just mashing buttons. Many people referred to arena as a game of chess. This is essentially a pawn messing up the chess board.
as for your other players in your team, due to the short CDs on these spells there is only so much you can do. Cdew wouldnt have posted on twitter saying TSG will be the strongest if i was wrong.