CL for animate undead Question & questions on web control

[D&DPrinceTandem]

So here is an example build for this question
only righting what matters
Race Human, Lich (spell stitched gaining Animate undead and Animate Dread warrior)
class: Dread necromancer 20 (advanced learning: Animate dread warrior)
Possession: Rod of undead mastery
Wis 30/10
Cha 30/10

She has both the spell Animate undead and the SLA Animate undead, both have a caster lvl 20. Do we add them together for the total for how many undead Hd it can control or do we have each controlled group separate so we have 2 different groups?

if (a) then it looks like this
(4+10) * 80= 1120hd

If (B) then it looks like this
((4+10) * 40)+(4*40)= 720hd


Web control
If (A) and she only takes control of lvl 20 Dread necromancers with a 20 in cha and they have Spellstitched, they also continue the line of webbing on 19lvl necroplitan Dread necromancers, who continue on 18 all having 20 cha.
Itself
20thlvl: 56 of them
19thlvl: 2122 of them
18thlvl: 80836 of them

Better than any Undead leadership possible

If (B) with the same stipulations as above
Itself
20thlvl: 36 of them
19thlvl: 936 of them
18thlvl: 25686 of them

Still better than any Undead leadership possible, even better than Epic leadership with its Cha

Is this how it works?


Thank you!

[Lormador]

I don't see why the groups would combine at all. Animate Dead includes reference to "this spell" in its text, so regardless of its source the same hard cap applies.

As for Web control, I'm not sure what ability is being used to generate the chain of command... but whatever it is, there's surely the problem of not generally being able to find 25,000 18th level Necropolitan Wizards, Clerics, and Psions at the nearest tavern.