Okay, so firstly Brentford, they didn't sign anyone for a lot of money, they were a team that prided them on football science, taking players that were flops or unknown, for example Jota, was a relative unknown at Celta Vigo, and signed for Brentford on the cheap. Another example, is Andre Gray, who they signed from Luton developed and sold for £6 million, bringing in a big revenue, which they reinvested. Therefore, Brentford signed youngsters or unknowns very cheap and sold a few for a profit.
Sheffield Wednesday, at the start, didn't sign a lot of big named players, and didn't boss the league at all, nearly getting relegated, it wasn't till recently they've spent big, which hasn't worked out, as the spent money hoping to get to the premier league and now they haven't, which has put them into a difficult situation and the main reason why the players they've signed have only been on a free such as George Boyd.
Bristol City, really? haven't really achieved more than a relegation fights since promotion. But last season would have got relegated if it wasn't for Toby Abraham, so they are a team, who has perfectly used the loan system, which we've failed to use.