If he hits 20+ homers with average defense, he's far more than a back-up catcher.
No doubt. They were discussing realistic expectations based on what he's shown to this point in addition to what their discussions with scouts and people inside the Seattle organization have termed as someone that hasn't been willing to make changes - to this point. They weren't critical of the trade by any means. They just pointed out what many have - that they expect both Pitchers to contribute at the MLB level at some point, although not necessarily as significant pieces, and that the clock is already ticking on Jackson but the upside could still be there IF he matures and becomes more open to coaching.
Their mention about fitting the backup Catcher profile was based on their feeling that he's not a lost cause - they felt that he can turn into a solid backstop with a strong arm and some pop even if he doesn't reach his ceiling (which so few do).
The general feeling was that while there's no reason to be overly excited and call the deal a "win-win", but that it certainly made sense for both sides - given our current pitching depth, it's tough to say taking a flier or two like this is a bad move. My point is that you just need to be careful about making too many trades like it because it's easy to burn through that depth doing so. If you assume you'll use 10 SPs over the course of a season, we're looking at Perez, Gant, and Jenkins as #8-#10 now. Sims and Fried are #11 and #12 on my chart, with Newcomb and Ellis next up meaning they'd have to be added to the 40-Man Roster this season. JMO, but I think the brass would prefer not to do that unless Newcomb forces his way into the rotation for good.
I'm not condemning the deal at all - far from it - I'm with everyone else that wants to add potential impact bats when possible. I'd just prefer that they have a little better track record and/or reputation than Jackson appears to have if we're going to trade TWO arms that most expect to at least contribute to the big club in the near-future for them. The cost for Jackson seems a little steep for me given what he's shown thus far, but there's definitely talent in there.
When you look back at the 2014 high school crop, it hasn't been very good thus far, and it was widely viewed as a pretty weak class at the time as well. The highest-regarded name in that class so far has been Michael Kopech (who was #35 according to BA). Nick Gordon (#9), Alex Verdugo (#12), Toussaint (#5), Forrest Wall (#19), and Justus Sheffield (#20) were in there as well. Then you had guys like -
Tyler Kolek (#1)
Jackson (#2)
Brady Aiken (#4)
Braxton Davidson (#10)
who just haven't shown much at all to this point. While Jackson was the top hitter in the class - and considered for the top pick - it just wasn't a very strong class.