These are just your interpretations. Saturn was complaining because Kizaru was too slow in killing Vegapunk if he had any chance to kill him as soon as possible, he wouldn’t have waited. Why couldn’t Nusjuro avoid Atlas?
He complain Kizaru was taking to long but as soon as he saw luffy he said he understand.
Then he did other things like freezing everyone there and fucking up bonny when he could have easy kill VP then if he wanted to.
It not hard to see that Saturn had many chances to kill him but chose not to for what reasons until PX betray issue .( hell even Kizaru could also kill VP but was standing up watching them talk .)
When VP was begging him not to destroy the island , it was clear that when Saturn land on island he feel he could kill VP when ever he wanted so he was no longer in a rush .
Also what does Nusjuro avoid Atlas have to do with anything the elders were still getting hit all the time .
This was a 5 on 1 and oda use ussop to show that gunko got same regen hax as the elders and she still did her misssion .