One especially interesting thing about gsxr's factory attachments is the statement in the first one, as follows:

"In order to check basic engine timing, turn the engine
slowly (in normal rotation) using the crankshaft pulley bolt
until the mark on camshaft sprocket aligns with the mark
on the camshaft bearing cap (arrows, Figure 1)."

If that is a valid procedure for the OM60x motors, why does it not apply to the earlier OM616/7 which, I keep reading on this forum, require the use of a dial indicator?

Could it be that the dial indicator approach, which I understand allows for cam/follower wear, is obsolete, mistaking precision for accuracy?