Your last point is just false, Isco does track back. And he presses really good as well. Hell, the only reason Bale bothered is because Zidane dropped him last year. Before that he thought he was Ronaldo tier and stayed up front waiting for his moment. More than that, those runs don't help the teams position much. Benzema's positioning is worth much more, he actually does create space for Ronaldo to dive into. Bale makes runs just to see if someone will play him a long ball. Take the Clasico for example, with Ronaldo in the game Bale was our worst player in the first half and didn't add a thing. He doesn't have the same understanding with his teammates, as they do with each other.
Isco/Asensio are much more valuable addition to the team, their field play is leagues above what Bale is showcasing. His first touch is about on par with a brick wall. Doesn't do well in small spaces either, this becomes more of a con when playing against a side that likes to park the bus or press the players. In those cases Bale is useless, he is better suited for counter attacks. He needs more space because he ain't technically gifted like Isco/Asensio. Those two also know how to play between the lines and find the free man, Bale is just shockingly bad at those aspects. His vision and other abilities are such a downgrade, if you really follow Real like you say you do...then you would know he shouldn't make the cut. There is a reason he landed on the bench. The only thing that even got him to stay on the pitch for as long as he did, was his pricetag. Not even that could save him eventually.