PG's set to make $19,300,000 next season. Pacers have substantial cap room as well.
Gasol will likely opt in ($16,197,000 next season). LA is making $21,461,000.
If Indy wants to do somewhat of a rebuild, I could see something like Gasol + Danny Green + a 1st for PG and a bad contract. Indy gets a 3 and D guy for cheap (Green's locked in for $10 mil a season a couple more years) and a ton of cap space when Gasol comes off the books. Spurs get their 1 year rental of PG at the cost of losing Danny Green.