Honestly, Stew would be a nice addition, but he feels like he has fallen off since joining JDG. 6-man roster is still weird and I genuinely wonder why they switch in and out between carpe and Sylvan. I will say that there are greater issues that came from the T1 match.
The big one being carpe died first 3 times on attack meaning that 3 rounds were basically lost almost instantly since it's so difficult to open up Fracture without smokes. He did well on defence, but for some reason there were huge breakdowns on the attempt to enter site.
Another issue is that they have weirdly inaccurate reads - they hear spike tap, smoke off halls and flood from drop towards the smoke rather than towards the spike-planter. Derke got such a free ace because T1 decided to ignore the spike tap they heard.
And lastly, they really struggled to push off the operator holds with util pressure. They should have really tried to bait out any inkling of Derke's presence and rotated off of that information to pull the map because they kept hitting not only Derke's op, but the stacked site. They didn't stick together too well when fighting the retakes and it all felt very messy. T1 really threw Fracture which would have been a great map to steal because they broke down mentally and only read short-term.