Im no expert on Lynch, but have played him a bit. He has a lot of killing power in himself and his crew. Illuminated should not be underestimated with him due to the fact that they do 4/6/7 damage on targets with brilliance and the Flay trigger lets you cheat the damage flip even if it recieves one or more on a mask (maybe not that reliable, but still ). They also get on both attack (with ml6) and damage flips if they are in line of sight to someone (Huggy) with the addict upgrade. Between them, Huggy and Lynch himself you do have a lot of killing power. You can also bring Stitched who also benefit from addict on attack flips and can protect Lynch a bit with their cloud.
Graves is a good model, but he doesn't do more for Lynch than he does for other Neverborn masters. He is good if you need him. I don't own Tannen, so can't really comment on him.
I've played with only one beckoner. Mainly because I only own one, but two seems like a rather big investment to me, if you don't go all in on brilliance or need a lot of lures. But both Huggy and Lynch himself can hand out brilliance.
Doppleganger is good in all Neverborn crews. Terror Tots are good scheme runners with him because you can use the ace of masks several times, and The Depleted are good tar pits.