SFGRTB
Superstitious Fan
If the rumor reported here is true, a reason why I don't want Tulowitzki is the idea of Belt being platooned at 1st base with him. If that happens, Zahidi loses some good will with me. Belt is an accomplished defensive 1st baseman. Even though Tulowitzki was good defensively at shortstop, there is bound to be some defensive issues with him at 1st base. And while Belt struggled against lefties in 2018, Tulowitzki actually did the same in 2017. He hit much better than righties that year. Considering that Tulowitzki's best season in his 3 and a half years with Toronto looked a lot like Belt's 2018 season.
I'd hardly call that a rumor, more speculation.
I would think Panik would be the primary platoon guy over Belt, even just for, as you say, defense alone.