That's not how that stat works.
TPA is based entirely on box score measurements (points, rebounds, assists, blocks, steals, +/- etc), therefore higher box score averages = higher TPA. It's just another iteration of BPM.
Players who average a high amount of defensive rebounds get an artificial bump in defensive points saved. TPA is not a stat you use to determine who's actually playing defense, or "when the other team actually attacks him". Westbrook has been the highest ranked player in TPA, and defensive points saved over the last 3-4 seasons because of the fact he averages high box score #s (most notably over the last two seasons, averaging a triple-double):
Does the obvious need to be stated where a "defensive points saved" metric which shows Westbrook (who instead of actually playing defense, goes hunting for rebounds - one of the worst defenders over the last couple of seasons), is ranked higher than Adams, PG, and Roberson?
I'll tag
@Originalman,
@NYC Rebel,
@The_Third_Man and
@Youhadasparkwhenustarted just so they aren't fooled by your bullshyt.