Bas Dost has a very good record both in Holland (32 goals in his best season), Germany (16) and Portugal (34 goals last season).
Plus he's 28 so he's at his prime.
Problem is, he's a left winger. We already have Bolasie and Lookman and are apparently trying hard to get Sigurdsson who, while being different kind, prefers the same position.
I, too, don't expect this to happen. Southampton aren't too keen to sell in the first place so it would take stupid money and if they were to sell there would be no shortage of suitors.
Depends on opponents and whether playing home or away really. And there will be lots of two-match weeks if we qualify for EL so there should be enough games Schneiderlin/Gana/Davies/Klaassen/Barkley.
Nigerian sources seem to think this one's in the bag: http://scorenigeria.com.ng/2017/06/27/scorenigeria-world-exclusive-onyekuru-bags-5-year-contract-with-everton/
Overrated? Where? He has a goals per game ratio better than Lukaku and Vardy and offers more overall yet mostly people seem to think he's not that good.
He would fit Koeman's tactics perfectly. Look at Pelle, a quite mediocre striker from Serie A. Giroud is a proven striker from the PL and overall a much better player but they have the same traits that suit Koeman's style. We just need quick wingers to play alongside him.