I actually read that in a similar way to BillyBudd.
The Penguins want 1 puck mover and one safety valve on each line. It makes sense that you would break your pairs up in accordance to your puck movers.
Letang is unquestionably the Pens' best puck mover.
I think you could make an argument that Despres is second-best (against Ehrhoff, I don't think it's close with Martin), but I also know and accept that they'll never promote Despres over both Martin and Ehrhoff.
In that sense, it's not "is Despres good enough to move up to the 1st or 2nd pair" it's "you'd be limiting either Despres or the person he's paired with AND removing our best-remaining puck-mover from the 3rd line"
In fact, when you think of it that way, having pairs of:
Martin - Letang
Ehrhoff - Despres
Scuderi - Bortuzzo
it makes it easy to look at that article and understand why Bortuzzo and Scuderi don't really work well together.
I guess the only thing I'd question is, if this is what you really want - and I accept that it is - shouldn't Scuderi be moving up over Bortuzzo?
If Scuderi is playing fine in the context of this role, he should be able to play fine with Ehrhoff (Martin - Letang should be the top pairing with these 6players, imo). Scuderi is already playing increased minutes (and feel free to debate who you'd rather have playing 18 minutes a night between Bortuzzo and Scuderi) and Bortuzzo - Despres has worked in the past.
If this is their plan moving forward, I would hope that neither Martin nor Ehrhoff are retained.
Letang, Despres and Pouliot should play the puck-carrier/breakout role next year, and a mix of Maatta, Harrington, Dumoulin and Bortuzzo can fill out the "Scuderi" role.