New way to play?

Not sure. Either naked or with Hydra Gauntlets.

Mmm...how will you deal with the fact they are not fearless? They need Shadowseer with Mask of Secrets or something like that. Cause otherwise they will just bounce off target due to combat result.

What about a naked Archon and/or Autarch that declines duels but allows LD 10?

Doesnt matter, if they lose combat by 3 wounds they will roll with severe penalties either way. Tarpit needs to be fearless or win in combat, in case of Wyches it needs to be fearless.

I actually dont understand why Wyches, any of the coven formations gives tarpit units, that might do its job good and be fearless turn 2. Grots are good tarpit, only in addition horrible things happen in that tarpit.

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Either naked or with Hydra Gauntlets.

Come on, wyches are there to be value with 4++ and 10 points cost, you dont really expect them to hurt stuff, do you?

I tried this with Grotesques yesterday.  Took a Grotesquerie of two six man squads w/Aberration and Haemie with Scissorhands.   My opponent brought a nasty unbound all TWC Space Wolves list backed up by four triple Las Cannon Predators.  My Grots killed two squads of TWC and tied up the other two until the end of game before they (sadly) died.  But they held on long enough to secure me the win, an 11-2 DE victory.  The Grots tied up the Space Wolves, allowing my 9 Venoms to score Maelstrom objectives and rack up the points.

Congratulations! Grotesques are awesome!