If I take Walters I will have 4 premo midfielders missing in round 14.
The decision should be made on a holisitic view of the impact over the rest of the season
How much do I lose by not having Walters in Rd 14?
Do I get more points across the other 12 rounds than the other choices?
If so how many more and do they offset the Rd 14 loss?
Will I be trading in someone else who I want in my final team? What is the cost differential?
How much is Walters DPP status worth?
etc etc
Say Walters averages 105 for the next 12 games = 1260 points
Rocky averages 95 for the next 13 games = 1235 points
Then it comes down to injury risk, coverage and a bunch of other considerations. If only playing for league or in cash league it's not even a discussion, it's closer for overall ranking and depends where you rate their output