I disagree. Firstly, he did not convince himself Batman needs a Robin so he could join the gang. He set out to find Dick and to convince Dick to go back to being Robin again. That failed. I believe, but would not swear, that Dick initially brought up the idea of Tim being Robin. This is, of course, as it originally played out rather than anything said/retconned later.
And Tim was not detached and far less likely to think he knew best in the old days. He had a
very different personality in the 1990s then in the 2005-2011 era. I would argue that having this role, having so many around him die, having writers decided he need to change absolutely messed him up, emotionally-speaking. He used to be a good deal healthier. Not necessarily when he first showed up (when he still wasn't detached), but definitely during the first 100 issues of his own comic. I definitely consider him, like Bruce to have quite emotionally "messed up" in some eras.
Stalking Batman and Robin - as far as I can tell, it's heavily fanon. I started a
thread on it a while back. As far as I've been able to glean from his original appearance, he only followed Batman
after Jason died and he became concerned about increased violence levels. All the other material he has seems to be newspaper and magazine clippings.
As for "Batman needs a Robin" - it gets attribute to Tim, because it's part of his origin story, but he's not the first to say it. I've actually discussed the difference in tone and implication in it's earlier usage before. I won't say this was the first time it was used, but it was close enough to Tim's debut to make me wonder if it was deliberate.
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