Are we to believe, from that wall map in HA Avengers #5 that Tony Stark and Maestro teamed up at the start of Age of Ultron, to send Kang back in time to talk the Avengers into coming to Ultrons future and convince Ultron to lose? Sort of like an Avengers : Days of Future Past? Because that's what it looks like from that time line map.
We, the reader, catch Age of Ultron #1 a week after Ultron wins, but we don't know what goes on between the start of Ultrons fight, and 1 week later. Did Kang arrive at that point, day 1, in Age of Ultron, and try to beat Ultron 20 times and lose, but in the process, break time? Then (Stark already being there), Maestro, and Avengers Next were there in the MU because of Kang bringing them there. (Remember, the Age of Ultron Ultron didn't appear until Avengers #12.1, way after Avengers #1-5). It's possible Kang brought Avengers Next to Age Of Ultron, even Maestro, in the hope these two forces could defeat Ultron but it didn't work. Kang had 20 goes at this to try and find a combination that would work. Maybe Maestro and the kids stayed there after their turn failed. Maybe Stark was the only one who could steer clear of the carnage and that's why he had that wall chart, as the only one who recorded all the events from Heroic Age up to Age of Ultron? Once Kangs egotistical plan failed, and the Avengers from HA Avengers #1-5 helped restore time, then Ultron attacked in ernest and won.
If that is the case, we can slip HA Age of Ultron #1-5 just before Age of Ultron #1 as an Avengers : Days of Future Past saga.
Post script : Then we have the other part of the wall map, post-Age of Ultron, which shows a sudden end of everything like a big lens, and there is nothing after that. Did Stark already know the end of everything, like he admitted to Rogers in Hickmans finale Avengers #44 portending Secret Wars?
Really, Marvel could do one thing that would change Hickmans version of events, and that is to go back in time to before HA Avengers #1-5, and never allow the Intelligencia to find that Space Knight in the cave. Then this whole Secret Wars would never have happened. I'm convinced the only thing that made Secret Wars happen is the breaking of Space-Time, causing the anomaly that Builders ever existed, that Beyonders created Molecule Men for this sick purpose, and a host of other unlikely events like Arno Stark, Original Sin, and AVX. These are just leaks of bad alternate realities infecting the MU.
If some time traveller could erase the Space Knights discovery, the MU could be restored.