I think the 1 wd is too harsh for nico. Making him easier to kill and reducing his ability to draw made him less efficient. But summoning ar 1 wound is to far, compared to the other summoning masters, I doubt he will be taken anymore. I know I won't be using him anymore.
I say this because with the other changes he can still stay comparable to the other masters in ressers, now why not just take molly or kirai? If the goal is to win, picking the most powerful master to accomplish the goal. Nico will not be the most optimal choice over the other 2.
Kirai has always felt slightly stronger anyways imho. For summoning, she can summon effectively off her seishin (still at 1/2 health). The difference between the two was kirai threatened to kill the enemy models with ikiryo if you damaged her people (Nicos where better protected with death whip), and the models she summoned where in better spots but slow. So she started a touch worse support than him and now he can't summon anywhere close to her anymore.
Even molly is a strong support and for the discussion of fast, molly gives 1 of them an immediate free ap as a (0). All the while paralyzing or giving huge debuffs to critical targets. Her summons may be slow, but without love thy master, both die equally quick, but hers damage the enemy as it occurs.
(Reva/mcmourning isn't summoning masters really so no comparisons).
Decay is a weak spell for damage, if for healing, nico is reduced to a +flip and nurse+chiaki? If I wanted to heal, i would take them and not waste a master slot over it. I care little for a +flip for a weak master slot. A good example of that was the pre buffed ironside.
With the 1 wd, i highly doubt nico can be a dedicated summoner that he was renowned for and be a support master that the other summon masters can do about as effectively all the while actually summoning, which the ressers are known for.
So I agree with a previous posters post.
"The king of the dead has died, all hail the king."