Now that you guys mention it, the DT-influence gets more and more prominent the more I hear it, and given the band's participation in Portnoy's Shattered Fortress, it definitely makes sense why they might take inspiration from those songs and music and use it to mold the songs for Vector.
As for the album itself, I've given it a few good listen, and couple passive ones, and I have to say, it's grown on me. When I first heard it, nothing grabbed me quite like anything on their first four albums - it just sort of existed. Now that I've gotten more time with it, I think I like it a bit more, but there haven't been many standout moments on it for me yet, just good parts and a good vibe throughout the whole album. With albums like Visions and Affinity, and especially the Mountain, the songs tend to stand out and stand apart, while still contributing to the whole album, but with Vector, it just feels like everything blends together for me so far. Maybe in a couple of weeks, I'll get more used to the individual songs and recognize them apart from each other.
It's not BAD, per se, but it hasn't wow'ed me like Affinity did when it came out.
-Marc.