I like these types of statistics, however something more important than mins per goal/assist is actually passes per goal/assist/key pass/chance/etc
For an example compare KDB last season & Gylfi Sigurdsson in 2016/17 (because he missed 11 matches last season)
KDB: 37 apps, 2490 passes, 96 chances, 8 goals & 14 assists.
Gylfi: 38 apps, 999 passes, 77 chances, 9 goals & 13 assists.
That's 1491 more passes(150%) more passes than Sigurdsson has made for the same amount of goals created (22)
This would mean that KDB created 1 chance per 26 passes, 1 assist per 178 passes & 1 goal/assist per 113 passes.
Sigurdsson however created 1 chance every 13 passes, 1 assist per 77 passes & 1 goal/assist per 45 passes.
I would however refrain from comparing players that play in different positions, like KDB & Coutinho.