Djokovic has twice got his way in tennis politics this year.
The world No 1 is chairman of the player council and led a revolt against ATP chief Chris Kermode, who is being made to step down at the end of the year.
Federer and rival Rafael Nadal were very vocal in trying to get Kermode to remain in power.
And even Drysdale is still wondering why his predecessor is being removed from his position.
“I don’t know what [Djokovic’s] motive is in this whole conflagration, but I’m a great fan of his and I have a great deal of respect for his intellect,” Drysdale told ESPN.
“To shake things up sometimes is not a bad thing.
“On the other hand, I’ve never heard anything bad at all about Kermode.”
Another key decision which swayed the way of Djokovic is change of location for the season-ending ATP Finals.
The Serbian has previously called for the event to tour the world, just as it used to.
And earlier today it was confirmed London’s O2 Arena will lose the competition in 2021.
Turin will become the home between 2021 and 2025, but Drysdale is unsure on the move.
“You have there [the O2] a venue and event that’s working and profitable and is a great showcase for the game,” he added.
“I never did understand this compulsion to move things around.
“If it ain’t broke, don’t fix it.”
Djokovic is currently gearing up for the Madrid Open next month – the same tournament which Federer will play his first clay match in three years.