Eljero Elia, with two goals, was the hero, but Koeman signings Dusan Tadic, Graziano Pelle, Ryan Bertrand, Florin Gardos and Fraser Forster had also starred, not to mention the outstanding Harrison Reed, the 19-year-old midfielder promoted from the academy this season.
Saints stalwart Davis admitted: "I didn't know much about Elia. He has given us a little spurt the last two games and if he carries on like that then great.
"It was a similar story with the others who came in in the summer. As soon as you see them in training and the quality they possess it is a good place to be at the moment.
"Then you've got the young lads coming through, that has been a big positive. We had big players missing in Victor (Wanyama) and Morgan (Schneiderlin) but Harrison showed what he can do."
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