Deadlock ult an enemy a guaranteed kill most of the time
ISO ult you have a slight advantage but there is a good chance you die and make it a 4v5 ,what should your teammates do when you ult, let omen enter the site on the duelist's behalf.
I think its better to use Iso's ult as an emergency button. Raze ult? Iso ult. Chamber ult? Iso ult. Kay O has his ult and you have a sharp approximation of where he is, Iso ult. He can hard counter any real counter without even killing him, I mean kj playing docks on ascent, iso ult as the team rushes in and all that kj util is useless regardless of whether iso kills kj or not