My sources are those that work in the Jays offices and I will leave it at that. The deal doesnt necessarily involve Grichuk moving out. Gurriel and Teo are options as well depending on the options to acquire.
The goal of this front office is to better balance the lineup now. It is very right handed specific. They were interested in Moustakas prior to him signing with the Reds. The goal at the time was to play him 2B when Guerrero was future at 3rd. Their views have changed and Guerrero is slotted to play 1B.
Adding 2 players like Brantley and Moustakas both LH hitters balances the lineup in a big way. The deal I am hearing is Teo, Roark, Zeuch, Martinez for Gray and Moustakas. The reasoning to keep Grichuk is because of his versatility to play all 3 OF spots.
Take it for what its worth. But thats what I am hearing