Just to make the case for Hackney, because I still think he'd be a fantastic development signing if we have space for one alongside a proper defensive 6 - here's some more high-level stats on him:
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The things that obviously stand out are a) the Deep Progressions (that's passes and carries into the final third - i.e. moving the ball into attacking areas) and b) Dribble & Carry OBV (that's essentially how much do his dribbles make his team more likely to score and the opposing team less likely to score). He is BANANAS good at both for a young player.
The other thing is that he is defensively pretty mid - tackles and interceptions, how much he gets dribbled past and how much value his defensive actions add are all pretty average at Championship level. This is understandably what is giving prem clubs pause. BUT - the other thing that stands out to me here is is possession-adjusted pressures. He has a hugely high work-rate defensively. This is probably what leads him to be out of position a lot, maybe a bit of a headless chicken defensively. I'd argue that defensive positioning is probably the single thing you could be most confident about coaching a player coming into their early/mid-30s, and he's got the athleticism and work-rate to get into the right places, he just needs to be taught where those right places are.
If you can coach him to be even just Premier League average with his defensive positioning, rather than Championship average, then you've got a really good Prem midfielder for cheap.
Anyway that's my rant, I hope we have 15-20m left over to get him in and train him up.