Probably, but Jason will be a much better baserunner and fielder. Even if you don't agree with the value WAR places on defense you cannot deny that Jason isn't much much better in both of those categories.
Baserunning sure. Defense is a horse of a different color. I'm certain Heyward is great defensively, but I don't know how much better he is at RF than Upton in LF or Freddie at 1b (well mostly just Freddie at 1b).
If you don't think Heyward is vastly superior to Freddie defensively, you're watching something totally different. Of the 2 things a 1B is judged on, fielding range and covering the bag. Freddie is above average at the latter, and one of the worse at the former. At best you can call him an average fielder. Maybe a hair above average. Jason is one of the best defensive RFers I've seen. In fact in the UZR era, only Reddick has him beat. He's like Ichiro but can hit better.
If you don't think Heyward is vastly superior to Freddie defensively, you're watching something totally different. Of the 2 things a 1B is judged on, fielding range and covering the bag. Freddie is above average at the latter, and one of the worse at the former. At best you can call him an average fielder. Maybe a hair above average. Jason is one of the best defensive RFers I've seen. In fact in the UZR era, only Reddick has him beat. He's like Ichiro but can hit better.
But it doesn't measure scooping which is a major component of Freddie's defensive value. And again, it's hard to compare by different positions.
But it doesn't measure scooping which is a major component of Freddie's defensive value. And again, it's hard to compare by different positions.