This is a fascinating question, does he have an advantage because he works with world class players or is it a disadvantage because of the pressure of losing 3 games on the bounce and he's sacked, Ferguson is the best ever for me because he built a few different successful teams that won loads however he was given time to do it.
Big Sam for all his faults has to be classed a success because of his team building skills, however someone like Bobby Robson did it in both situations, for me you need a certain standing to get the big job it's how you get that, that's important.