My favourite interpretation of the Robins(5 of them, not because i don't see Duke as a Robin but bc this doesn't apply to him) is that all the Robins after Dick are just insecure about him. Why? Dick is a Jack of all trades, and it just so happens he has all their trades too.
Jaybin when he was Robin always wondered, if Dick came back, would Bruce still need him? Batman talks about Dick a lot and tells Jason how Dick would've done it, as if Jason's method wasn't good enough.
Later as Red Hood Jason still feels some of these sentiments towards Dick. Jason was good at tacts and analytical thinking... but so is Dick, maybe not as good as Jason but if Jason died or something Dick could fill in for him, not as well but... still really good.
Then there's Timbin, Tim sometimes sat on the building a thought bothering him. 'If Dick came back, would Bruce just fire me?' Tim's good at hacking stuff, computers and being really smart in general... but Dick was too. Not as good but still so good that he could easily substitute him if Tim were to not do it anymore. So, would Bruce just fire him?
Stephbin always knew if Tim were to come back Batman would throw her away... and she was right. Later when she was Batgirl and even up 'til she was Spoiler, Steph actually met Dick and worked with him. Steph's strengths were stealth, determination and intuition. But Dick was also good at that. He was almost as good as her at Stealth, probably as determined as her and could also be creative on field. With Dick around- how much did Gotham need her?
Damian always looked up to Dick, he really did... but when Bruce came back, almost all he talked about was how great Dick was. No matter what Damian did, Dick was better. Dick was always better no matter what. Bruce never even chose Damian anyways, he chose Dick and Damian would never be able to compare.
And then meanwhile Dick is thinking about how replaceable he was to Bruce, that Bruce had managed to replace him 5 times, that the other Robins all managed to fill that same hole Dick left in him when he left just as well. That maybe the other Robins were better for Bruce than he could ever be...
















