Great - you've made me watch the first half again...
Watched the rest of the first half; taken the same detail of notes, but not going to post again (as we recall, it's not very exciting).
Wijnaldum spends two noticeable spells (23-28 minutes, 39-46 minutes) as the left sided midfielder. For the 39-46, Milner actually goes central and Henderson to the right. That spell is the clearest indicator of what the heat maps show more consistently - in possession, Henderson and Milner generally operate as a two while Wijnaldum wanders (somewhat aimlessly at times, my notes record, but not always) ahead of them. Also possibly of minor interest, it 'seems' to be Milner who initiates all of the 'switches' between the midfield three (whether there are signals from the bench, I can't say; but of the players, it's Milner who seems to make the move and the other two adjust).
There's one interesting observation on shape in this last spell - whenever Milner and Wijnaldum are the wider midfielders and the ball is on the opposite flank, they narrow, i.e. occupy the central area 10-15 yards inside Palace's half. There's one very clear example a bit after 42 minutes where the ball is on the left, Robertson/Wijnaldum can't progress down the flank and Wijnaldum turns inside - and there's an enormous hole in the centre, as Henderson has held his position right of centre and on the halfway line, not adjusting to the play.
In that last spell, a couple of 'actions' from Wijnaldum of interest that don't record on the stats and a couple that do. On Firmino's driven shot that Palace counter on resulting in a shot by Puncheon, Wijnaldum from just outside the Palace area (and Firmino) chases the counter all the way back but is never close enough to affect the run of play. Twice in the closing 5/6 minutes, Wijnaldum gives to Robertson, runs down the left as Robertson cuts inside, eventual return pass is delayed a little too long. Robertson seems to combine more 'instinctively' with Milner. Firmino/Gomez break down the right ends with a poor low cross toward the six yard box; Wijnaldum free on the edge of the area calling/gesturing for the square ball. The last action is a bit unlucky; Mane cuts inside from the left, Wijnaldum anticipates the pass, checks over his shoulder and turns into space on receiving it, but the ball sticks under his feet and he has to turn and retreat.
Not the most exciting hour or so re-watching, rewinding and noting that quarter of a game
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The shape stuff was the most notable; if the ball was being passed around at the back, Wijnaldum generally took the AM role (Milner occasionally), regardless of which side they were playing. But, apart from Matip a couple of times, and the odd ball inside from either full back or wide player, neither received a pass in that area from Henderson. I don't think I even mention Klavan in my notes
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The other point that stood out after watching the second quarter - and I'd noted it a couple of times from the first - is that Firmino was the player who had the most opportunities to play quick give-and-go's when cutting inside with the ball in the attacking midfield area, but spurned the opportunity every time, preferring to play the ball back (Henderson) or wide (Gomez). While that doesn't show that Firmino "can't play wide" or deeper (rather than as the false 9 he generally does), it does suggest he doesn't offer the same
type of linkup play as Coutinho or Lallana in those areas, or
only does so with one of those two. His interactions with Mane/Salah so far this season have generally been more the final through ball for one of those two, not one-twos. If he made a pass to Wijnaldum at all (and I'm not sure he did, without re-watching certain passages), it was during simple exchanges on the left, while passing up more intricate opportunities in the centre and one on the right, when they were both over that side around 36-39 minutes.