No problem, glad if anyone finds them interesting!
With regards to full alpha, that would typically mean committing Kurnoths, Alarielle, and Drycha into combat turn one (and get a high value swarm of squirmlings shot with Drycha in the shooting phase). Often you'd end up charging the summoned unit of 20 dryads and the general in for extra oomph, as well as pile-in control.
For the alpha to work, two things need to happen: you need to get at least two out of your three pre-game abilities (so you get both of the movement ones), and the opponent needs to have messed up their deployment. For example, my game three at the BMC one dayer the week before BOBO was against Nagash, 30 grims, 40 chains, couple chars and chaff. He left his Nagash unscreened from one flank, so I redeployed the Kurnoths 6" away from there. Drycha went after the chainrasps, and Alarielle went after the grimghast. At the end of my turn one the chains were down to a few models about to battleshock off, Nagash was dead, and the grims were down to half the starting size. Had he screened his Nagash better and spread out the units, I would not have tried a full alpha.
Re: defense layers, I virtually always summon 20 dryads from Alarielle, which gives me 20+10 dryads to work with and 4*5 spite revenants. Without Ranu's Lamentiri summoning extra dryads is a bit iffy, so I always plan as if I get zero dryads from Branchwraith summoning.
It's a bit difficult to explain in words how the layering works but I always have a few goals in mind: force the opponent's to charge through wyldwoods to get to anything, make sure it is difficult to engage more than one unit at a time, have enough layers that it is difficult for them to get to my high value targets even if they double turn, and have the hammers in position to be able to capitalise on any overextensions (e.g. my game 5 at BOBO my opponent charged his Archaon into some chaff, but he could not pile-in to be in range of Drycha - I had 6 kurnoths 11" away ready to charge it in my turn).
Finally re: Archie - I haven't really had a chance to playtest the list with him, but I was going to run it with a straight swap of the 10 dryads. He would be the general with Warsinger and Betrayer's Crown, while the second branchwraith could now take Ranu's Lamentiri. Arch-Revenant makes kurnoths stupidly good, would be a fast scoring character, and could deliver betrayer's crown a lot easier thanks to 12" movement and fly.
Bit of an essay reply, but hope that helps!
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