I think if Pochettino didn't do such a great job in the same timeframe as LVG then it would be easy for everyone to say "rebuilding the club takes years blah blah".

Fact is, it doesn't, as Poch shows.

He took over a side with big egos and deadwood (sound familiar?) with players like Sandro, Sigurddson, Livermore, Holtby, Dawson, Naughton, Lennon,Assou Ekotto and Adebayor.

He's done as big a rebuild as LVG and has improved more than LVG as well.

TL;DR LVG is not rebuilding the club, he's holding it back.