Not every manager achieved what Martinez did. Not Royle, not Smith, not Moyes.
To even question Martinez ability to get value is ludicrous, after his wheeling and dealing in the loan market last season. If ever a manager gets great deals, it is Martinez. And the player you highlighted was a free transfer that played 7 games last season. I recall Moyes signing a terrible centre half, not on a free, but for £5.5m. He was that bad, he lasted 4 months before being binned off, and we had to bring back Alan Stubbs from Sunderland to get a degree of stability back and starve off a whiff of a relegation battle.