Hi
The trouble is he is scent marking by urinating to try to keep and establish the kitchen as his territory against your other cats. He clearly feels threatened and stressed by their presence and from his point of view he was there first from what you have said. You wont be able to make all the cats get along. Fundamentally cats prefere to be solitary creatures unless introduced to others at an early age or as litter mates. They can easily view other cats that are introduced as rivals and something to repel so that progresses to fighting if there's not enough space for them to avoid each other. Now your female cats are adult he sees them as threats. I would not force these encounters as potentially it is making matters worse. Maybe if you can give them all space away from each other the spraying and fighting will stop or at least reduce.
Cathy Wickenden BVet Med MRCVS
Barton Lodge Veterinary Centre
1 Midland Road, Hemel Hempstead, Hertfordshire, HP2 5BH
Tel: 01442 216048 24 hours
[
www.bartonlodgevets.co.uk]