Then why would Spurs go this route? Gasol didn't just up and decide this on his own volition; he's clearly working in concert with them. With Jefferson, it was about ducking the tax. That's not a concern in this case. Clearly, they want to increase their flexibility now, which tells me they intend to upgrade PG and aren't enamored with '18 free agent class. Otherwise, they'd operate over cap, utilize Mills' Bird rights to re-sign him and have MLE at their disposal.
With cap holds and sequencing required, I'm confused as to whether they actually have the $25M in cap space being reported, but if they do, that possibly gets them in the game for Paul (1+1, opt out after 1st year, sign 4 year max; "only" $10M short of what Clippers can offer), probably would for Holiday and definitely would for Hill.