He has 7 secondary assists on the PP. People really overexaggerate how many assists he gets by just being a bumper/net front guy on a stacked PP. Nylander and Marner have more secondary assists on the PP than Tavares, while Tavares has 1 more primary assist than Nylander and only one less than elite playmaker Marner on the PP... And I am fairly sure he gets the fewest puck touches on the PP too.
Most of his secondary assists come at ES, where he would often make more important passes than the guys who end up with the primary assist (either by an excellent pass in the neutral zone or winning a board battle deep in the zone which extends possessions and eventually leads to a goal).
Secondary assists are usually crapped on, and there is somewhat of a reason for it. Sometimes they have nothing to do with the goal. However, for a guy who gets a lot of his secondary assists by winning board battles or making smart plays which start goal sequences... They are not empty. They just don't get noticed by most fans' eye tests, which is why those eye tests are not reliable.