As far as Rendon and Stras. That's really not so much a short term money issue. It's about Rizzo balking at giving out 8-10 years to Rendon of which 4-5 years are going to be dead money. I'm sure they'd glady take Stras and Rendon on for 3x40 each. The goal for this organization seems to be to be competitive every year and stay just under the cap. Having long term deals that will inevitably lead to 30-40m/year in dead money does not work for that model.
somehow, I think 6 years, $35MM AAV, with an option for a 7th, I think gets Rendon. Higher AAV than Arenado and I think the highest AAV for a position player. If Rendon is real about not wanting to play too long, then maybe the AAV is the thing. Heck, give him $36MM so it is a higher AAV than Max, if there's an ego thing.
As for Stras, I hate going long for pitchers, so I'd hope 6 years, $30MM AAV would be good for him, but he's a total free agent. That's still a discount to whatever stupid money NYY, SD, LAA, or PHI will put on the table, so maybe give him another opt out or two.