I wouldn't pay Lowry close to the max for the next 4 years. no to that. I think that's a very inefficient way of utilizing cap space. There's no quick fix, so stop thinking overpaying a fat PG who has maybe 1 or 2 good years left is the answer. It's not. With or without Lowry, Spurs will be 2nd-4th seed in the West.
If Patty doesn't take a hometown discount, he's gone.
If he's gone, I find a cheaper option like Mack or Collison for a 1+1 deal to help Murray til Parker comes back. By the time Parker comes back, Murray will likely be ready for a bigger role on the team and be the starter by AS break. Parker may be a s of himself and if he is, the Spurs will have many resources to use to get a PG in the summer of 2018 -- that is if Murray isn't the guy. But I have a feeling that won't be the case -- I think Murray is the guy.
Also, I would much rather move LA to get a role player, space and a pick than move him to sign Lowry -- who has problems keeping his weight down, and who's best days are behind him.