If the competition was based on time trialing ability, then yes, Ingy is a top all-time GOAT candidate for sure.
...But it's actually a race, not a time trial. A championship races to be exact. Ingy has proven to be only a marginally good championship racer in Championships where there are several top competitors. His top end speed is the slowest of everybody toeing the line today.
ElG never had pacers, super shoes, or pacing lights. Neither did Coe and Cram. World Records never last and when Ingy last won a 1500 global championship there was only one strong competitor (Tim Cheryot). Now there are 3 -5 legit top competitors plus others banging on the door. ...and they are each much faster than Ingy over 800 meters.
Ingy is the GOAT 3k-2 miler, period.
Ingy is among the GOATs at 5k.
Among the current crop of incredible competition, Ingy cant win Global Championships any longer at 1500/mile so not a GOAT miler.
...But he is a better Miler than a Half Marathon guy that's for certain.