I was really pleased with DeKeyser in that final stretch. He played hard minutes, he put up points (with no power play time), and he seemed to gel with Hronek. I actually have DeKeyser-Hronek down as my preferred top pairing for the beginning of next season. As I've said, if he's playing like that all of the time, his contract isn't a problem. Even when he's not 100% on his game, we don't really have someone who can adequately fill his shutdown role.
Abby...oof. He's a bottom-six roleplayer who can be a serviceable top-six complementary winger when there aren't any better options. He's slowing down. He's dealt with some significant injuries in recent seasons. He can't produce offense on his own.
Right now, I like DeKeyser way more than I like Abby. But then, I'd pretty much given up on DeKeyser before he went on that nice run to close out the season. So maybe Abby surprises me next season.