Encarnacion was a top 50 prospect in baseball before he came up, and then spent years drawing walks and not striking out (pre breakout) before things finally came together with his power. It's not like he was striking out 30% of the time with a 6% walk rate and suddenly became really good. He was also ass as a 3b, and once he moved to 1b/DH, he probably relaxed a bit more.
Bautista was a rule 5 pick that bounced around a lot but even before his breakout he at least had the makings of a good player (similar to Edwin, drew walks and had a low K% but wasn't showing the power potential he eventually had). In his case he changed his swing and became elite, but again, it wasn't taking a fringe talent and getting lucky. There were some aspects of his game that looked appealing before he broke out.
Obviously giving flawed players playing time in a lost year and trying to make adjustments to hopefully help them take a step forward can lead to good results. If Teoscar can maintain his stat cast numbers from last year but reduce K's and increase BB's, then you might have a good hitter there. But these are long shots. The Jays can't rely on them panning out. If it happens then it should be an added bonus. Where the Jays need to score big is their own prospects panning out, and also acquiring players from outside the org that pan out. If they keep focusing on McKinney and Forrest Wall types, I'm not liking the chances of an impact player coming out of it.
That's why we better be focusing on the Padres when we trade guys at the deadline.