They've not bought 28 players, since he joined, they've brought 28 players to the club. They've only actually bought 12 players outright, 8 have been free signings and 8 have been loan signings. £4.65m has been identified as being spent on 4 of the signings, with the other 8 being undisclosed.
They have also let 18 players leave through transfers or frees, since he joined and let 29 players go out on loan. So all in all, they've a net buy/sell of 6 out, since he joined and a net in/out of 19 out.
To be fair to them and him, the club was in an absolute shambles when he came and the team was full of shite It's actually quite logical that he'd want to get rid of so much shite and bring in players he wants.
I think there is an excuse for him not winning the league this season and it is us. We've a very settled side and squad, that is quite easily the best in the league, that we will hopefully add to before the transfer window closes.
Also our team has had more spent on it, than theirs, over the past two seasons. Last season we must have spent around £12m-£15m on buying the likes of Edouard, Bayo, Shved, Gutman, Perez & Oko-Flex and this seasons we have spent around £12m on Julien, Connell and Bolingoli. I'd actually be surprised, given that they spent £4.65m on the 4 disclosed players, that the remaining 8 undisclosed players would have brought their overall transfer spending to not that much over £10m.