people often says that Mark was at his peak in term of guitar playing during the OES era
I disagree
why most people think he was at his best ? because he played fast ?
I find that for example rhythm guitar parts on setting me up, single handed sailor or skateway are far more difficult technically than all guitar stuff on the OES album
I also find that the twiddy bits on sultans are easier to play than outro lick on lady writer
To me "Mark at his peak" is not intro licks on Heavy fuel live, or the TR solo played fast; neither calling Elvis
His guitar skills peak is for example the lick doubled by the sax on Portbolleo Belle in 83
during OES era, Mark was very show off, palying licks guitar-hero-like, but it was more doing the show, rather than really "guitar-skills" in my humble opinion
ending licks on Once upon a time live on Alchemy impress me far more than any solo on the OTN album, or even bootlegs from 91-92
I think that this "mark at his peak in 91-92" thing is a wrong vision imho
I think I disagree there, for me it's not so much Mark's guitar-playing peak than his creativity peak you're talking about if I get what you're saying.
I am pretty sure in 1991 he could still play every note of his first albums but having "evolved" in his musical path he was choosing different way of playing stuff.
Mark keeps repeating that playing with Chet Atkins helped him develop his guitar vocabulary. His Neck and Neck album is (for me) some kind of peak in his guitar-playing ability, his phrasing and technique and, to some extend, in his musicality.
Mark was also quoted, by the mid 80s as saying that he though he had evolved beyond merely saying "hello" in his guitar language, he could now say "Hello, how are you?" with a guitar, or something along that same humble line.
Also I have a problem when considering a musician's peak so early in his carreer especially when considering how long MK's carreer is.
Let's not confuse favourite era with best musical ability. (I am not saying that you do JF)
For me MK's guitar peak was 1996 album and tour. As varied pieces as "Don't you get it" and "Je suis désolé" (a true gem) are both stunning on a guitar level. (one has a very fast solo and the other a very subtle guitar part)
1996 tour was musicaly the most stunning for me. The musicality of Sultan's solos was second to none, his playing was neat, varied and soulful with hardly any mistakes.
I think he wrote better songs after 1996, and still today but his playing has never been as consistant (for me). Sadly I think his motorbike accident did some lasting harm.
All that said, it's only a matter of opinion. Some may rightly think he is at his peak now for numerous valid reasons, one being his experience. Alchemy era is of course wonderful too.
And then again creativity and musicality are very subjective topics.