Martin Alvito
Player Valuation: £50m
Why does Delph put himself into those 50/50 tackle situations
That's usually a problem of declining speed for older players; your instincts developed over years say you can get there first, but your body doesn't deliver.
It's really hard to adapt to, because you have to rebuild decision-making from the ground up; as an example, Federer was a half-step slow to balls for several lean (by his standards) years before adjusting enough to grab a few more Slams.