Syndra Should Not Be Able To Grab Daisy because Daisy is actually needed
Voidlings are not central to his damage/cc and multiple can be spawned.
Tibber's summon is the actual ability, and does damage while applying her passive right when it is activated. The remaining pet is not central to Annie's strength.
Daisy does nothing upon activation except for a long cast animation that makes a Q-R combo impossible. Daisy needs to be around to hit someone three times to be used.
Dragon cannot be picked up despite being more powerful than Daisy and having a much longer leash.
Daisy is counted as a champion for the purpose of Ivern's E and Q and tower targeting, but also coded as a minion for Syndra's W? That interaction is lopsided at best.
Though with that explanation, this doesn't even seem to be an intention of Syndra's W. It's not like Syndra can outright negate Tibber's summon by grabbing him as soon as he's spawned. So maybe I should report this as a bug.

? He pushes turrets around as well, right?
?