My issue with the Hanson objection as stated above (link to the original would be appreciated) is that it rests on the assumption that the N-1 level AIs still under human control can somehow completely eliminate or suppress the self-modifying AGI long enough until alignment research is complete. Meanwhile, the unaligned AGI could multiply, hide, and accumulate power covertly.

Humanity would also need time to align AGI before any AI reaches the N+10 power level. The existence of all those N-1 level AIs in multiple organizations only means there are more chances of an AGI reaching the critical power level.