bredeveldt wouldn't be a bad replacement would he?
Bredeveldt is actually different type of player. Fast, technically very good, can also play wide and good finisher. At the times can be lazy. He did spent a few years in Germany (it may be at the some club or league as White from Auckland City) , but didn't manage to stay.
Slefandorfas is an overrated player who got lucky to score 11 of his 13 goals in three games against very weak opposition (against Hawkes Bay 5 goals in 7:0 win, against Waikato 4 goals in 5:0 win and another 2 goals against Manawatu 4:0 win). Hi is strong and can hold the ball up, but that's pretty much it. In recent games, which I watched, he needed several chances to score a goal, he couldn't read the game (most of the time wasn't in the space where should be), chose wrong option and often inaccurate in his passing. He seems to be a nice guy.
I believe Nikolic can be an influential player for WaiBop. This is only if he can give 120% every game (get involved in 50:50 challenges as well as defensive work, stay focused and positive). I share N-Bomb's view that he more than capable scoring goals.
Manko plays defensive/attacking mid position. In a few games that I watched he was very inconsistent in his play. From been very good in one game, to having very poor performance in another (most of the time: to many touches, poor vision, wrong passing, wrong options, playing to safe not looking up). He's qualities are: that he fights very hard to win the ball back, makes a striker's runs to add to the attacking strength ans can score a couple of goals, generally good passing, can hold the ball up).