Four more years of team control on Turner, the jury is out on how much he'll be worth beyond that. Rendon is the guy to extend.
When you're talking a 10 year contract it's not just Rendon that's a concern. You gotta believe Turners not going to forget how to play. Soto's contract will be well within that window. If Robles pans out he'll need to be signed within that window. Doolittle will want some money. Scherzer will be gone. Stras will be gone. You'll need to find pitchers. When you tie up that much for that long you need to look way down the road.