Of course Obama had a lot of superdelegates.  His surge started way before Bernie's (much smaller) surge.  And was way bigger (no surprise that Dems would be crawling all over themselves to jump on the first viable black POTUS candidate bandwagon).  

50 superdelegates did swap from Hillary to Obama later in the process, but that wasn't anywhere close to the 450 early-declared superdeegate lead that Hillary had over Bernie.  

Also, Obama and Hillary both occupied a similar lane in the middle of the Dem spectrum.  Bernie was in his own socialist lane (the far left of the party).  The only reason he even got more than the usual 10% or so for an extremist is because Hillary was such a bad candidate (the same reason that Trump beat her, in fact).