There are many problems with "experienced" syndicate members teaching/helping/guiding new members. The biggest one is that they are not instructors. The next is that they have often not had any tuition for years are and have forgotten some of the essentials. The next is that many syndicates re-write the manufacturer's AOM/POM, believing that various sections are wrong or don't apply. Then the non-instructor tries to teach the syndicate's codswollop to the new member. And finally, should the aircraft have a little problemette, who is PIC? The best syndicates have access to a instructor who will officially teach the new guy.
PM