Based on the provided text, here are the answers to your questions:

1. Will Son Heung-min play for Tottenham against Brighton? No, he's unlikely to make the squad due to a hamstring injury.

2. Who is tipped to replace Son in the starting lineup? Timo Werner is expected to take his place.

3. What was James Maddison's performance like recently? He's been playing well and has made an impact in every game he plays for Tottenham.

4. Why wasn't Maddison selected for England's upcoming matches? It was likely due to a decision by interim manager Lee Carsley, although no specific reason is mentioned in the text.

5. How has Dejan Kulusevski been performing this season? He's doing great, particularly in a central role where he can showcase his abilities to run on and off the ball.