He's abandoned driving to the hoop for inefficient shots from 16<3P and so has Kawhi, and they are both suffering for it. Our starting 5 shot chart from last year was completely different then this year. Options 1a and 1b are competing for the same hunting grounds, midrange shots that are low percentage and almost never draw fouls, and it's forced TD to abandon his jumper and resort to the dreaded postup for most of his offense, while all of our shooters are shooting more pull-up shots from further out later in the shot clock. We are playing a pretty dumb brand of offensive basketball right now, and the offense only really pops when Manu is playing well, but at the cost one of our two best defenders, Leonard or Green.
In short, Tony is shooting too much and from bad areas on the floor and it's compounding his decline tenfold as well as getting in Kawhis way and mucking up the offense.