Luck is a very elusive term, better to say timing. Sometimes things happen at a certain point and sometimes, even related to the rules or costumes of a certain period, do not happen. This goes from form, a rebound, changes of rules, etc etc etc. In any case nor Diego or Messi had precisely lots of timing going on in more than one area, in fact more things against than on favor. I would say that Diego in 1990 had more things going on in a general sense, yet he was pretty fvcked physically and the team surrounding him was really below par. But it's a pretty much futile discussion that would only show anyone predilection or in some cases mere agenda.