hello there. I’ve just taken a look at the said-confession and i do think i have quite a lot of opinions to refute it (well, and other evidences i guess but let’s see if i have the time to link everything in this reply).
so regarding how they said they only made up recently and their behaviours during RnM (promotions, making etc). like i mentioned previously, both of them had very intense rivalry, and according to magazine interviews (yuto’s 10,000 part 1 & 2 and yamada’s 10,000) we can see how strong that is. I will be mainly using these two articles to discuss this.
through yamada’s perspective, yuto has always been the rival that he cannot overcome. even if he’s the center of hsj right now, he has mentioned multiple times how he still feels that he wouldn’t be able to win against yuto (mentioning about how yuto’s multi-talented etc). as for yuto, it’s a new perspective through the 10,000 interview since we had the idea that yuto is generally just a sweet nice boy, so it gives a really different side to our opinion. we can see how he’s actually bitter, but got through it. I can’t find any translation, but it’s also mentioned in yamada’s 10,000 interview, there was an issue of myojo, and in yamada’s shinku corner he talks about his solo debut. he felt at ease when yuto replied his message.
next, solely referring to yamada’s 10,000 interview, if you could see the last part of it, he mentioned “This is the first time I mention this but, at that time I still had a bit of a wall left over with Yuto …” so he pretty much confirms how there is still that piece of wall between them, but it was mostly gone. this generally shows how their interactions during RnM period was mostly through their own and not just solely on fanservice.
imo, if you’d want to see how they give fanservice, try sourcing for 2009-2010 magazine scans where everything between them was awkward.
also i dont see any translation (i will link if i can, but this is the one i’m referring to) for the Wink Up special interview, both of them mentioned that they would’ve rejected the offer for such a crosstalk at the time where their rivalry was at its peak (which i will assume it starts to build up from 2008 according to yuto’s 10,000 interview, and probably got better to 2010 or mid 2011, they got around their feelings of rivalry and stuff).
i wouldn’t say that they don’t do fanservice. in fact i do believe they do. we are talking about yuto and yamada who gets joy from screaming fans when they do their SD routine, so yes.
in not a shipper perspective, i really think their friendship shouldn’t be doubted and it’s a really health rival/friendship they are having right now.
i do hope i managed to answer your question about their relationship during RnM uwu