I'll give Poch some credit last night. Playing Rose where he did was absolutely the right choice. When you setup against a team like Palace you have to stretch them across the pitch. Rose was industrious, got totally stuck in and he eliminated their attacking threat of Wan Bissaka. He stopped him from being tucked in alongside his centre halves. Nobody can convince me that Moura or Son in that wide area would have played with as much discipline. By stretching them, it also gave Trippier freedom on the other side and players like Eriksen more time on the ball in the middle.
Setting up with Son and Moura narrower probably wouldn't have worked especially with their tendency to switch off defensively. Son did that for their early chance when he stood their planted as Tomkins had already had an aerial tussle with Kane and he was able to move 10 yards and have a second bite as Son hadn't even moved to ensure we won an easy ball. Once he saw Tomkins coming he didn't even compete for the header and they ended up goal-side on Toby and should have scored. I know I keep banging this drum but Son needs to learn these lessons and grow a pair.
Playing Dele in deep lying midfield was also spot on. You can't tame Sissoko. He hasn't got the brain to stay in there and protect the back line but will bomb around all over the pitch destroying the opposition with his work rate. Dele played with a ton of maturity last night and proved what an asset he is to the club. That allowed Eriksen to play further up and you could see he started to look the part again.
For me, tactics spot on but our finishing wasn't. In fact we passed when we should have shot and shot when we should have passed about 5 times. That's worrying.