The context on motobe was explained repeatedly by himself. He admires the main cast and thinks they're valuable, and he thinks only a weapon master like himself can really take on musashi.
Not only that, his personality completely changed.
Also we have an edit function. Why do you keep making a new post like 3-4 times in a row? Just edit. Half this thread since page 2 is you making a dozen posts in a row for no reason.
That's really a bad habit i got sorry xddd
past events are referenced constantly
That's not really how a retcon works, most stuff can be retconned but letting some stuff up, at least that's how people in general use the term, you just need to look at the Wikipedia page
"
Retroactive continuity, or
retcon for short,
[2][3] is a literary device in which established
diegetic facts in the plot of a fictional work (those established through the narrative itself) are adjusted, ignored, or contradicted by a subsequently published work which breaks
continuity with the former.
[4]" this doesn't mean everything was completely and absolutely erased, but previous stuff being modificated for narrative purporses.
if there had been a retcon, Itagaki would've clarified
There's a ton of things Itagaki didn't said and we use it due to being logical, this doesn't actually means anything, Itagaki is not constantly speaking to answer every little doubt we have.
Some personalities have changed slightly either due to characters maturing or because Itagaki realized he couldn't keep Yujiro as an über evil bastard for the whole story.
The first part is not actually a thing, a character being rewritten is not character maturing, why would Baki became more coward post 13yr/o to became more determined and aggresive immediately after?, and the "Itagaki realized" thing is literally what retcon means, rewritting stuff for narrative purporses.
If your whole argument hinges on that, I frankly can't even call it an argument.
It doesn't, when i was rereading the series i seen a ton of weird stuff that should apply for retcon, but i didn't wrote that in my note cuz i fault it was irrelevant, for that i said i will reread it, so i WILL have more arguments within a few hours.