You said we can get him for "nothing", just pointing out that is far from the actual case.
As for Minties reply to Grace that triggered your initial post - Miller is a defender, at present Balta's best position clearly looks to be down back whilst he still looks miles off it up forward (he even looks better as a mid/wing type than he currently does as a forward) and Coleman-Jones is ruckman first and a forward second.....even of those not mentioned, Callum Moore is a utilty and third tall, second tall in an emergency at best and Chol's in the same boat as CCJ, though he could still also become a defender.
So yes, though I think midfield depth is just as big an issue, Lynch would be very handy for us indeed at this stage.