It’s certainly time to give Seriki a run and see what he’s made of defensively against a good side like Sunderland. Gilchrist is solid as a rock in 1-1s, is good in the air and his defensive positioning is excellent. Seriki doesn’t give me that confidence yet but, as you say, his physical attributes are insane and that allows him to cover us on breakaways and cover his own slips.
Might be a bit of a gamble and I suspect he might have the odd uncomfortable game against tricky wingers, but what he gives us going forward makes it worth it. That combination of JRS coming inside and him going outside down the right is a complete nightmare for defenders. He also allows us to break a press or disrupt a med / low block by the speed at which he takes any space in front of him. With gilchrist there, the Oppo just lets him have it and double up on JRS because they know Gilschrist won’t hurt them.
I think they will both have their roles to play this year but Seriki is looking like the surprise of th season if he can keep his form up. We’re a completely different attacking force with him in the side.