Alcano should definitely be on the list.
Efren won't play Dennis even in big matches in rotation-games.
When I was in the Philippines recently all these matches were even:
Efren Reyes - Lee Van Corteza, 10-ball (Efren won)
Lee Van Corteza - Chia Ching Wu, 10-ball (Wu won)
Dennis Orcullo - Alex Pagulayan, 10-ball (Dennis won 32-30)
Dennis Orcullo - Alex Pagulayan, rotation (Alex won 21-20)
Efren Reyes - Ronato Alcano, rotation (Efren won 15-12 (down 8-4))
Ronato Alcano - Dennis Orcullo, rotation (Alcano won 15-13)
Ronato Alcano - Fransisco Bustamante (Alcano won)
Ronato Alcano - Alex Pagulayan (Alcano won 15-6)
Alcano and Wu both refused to play Alex Pagulayan 10-ball. Alcano declined just after they played for many hours rotation. Wu didn't want to gamble in 10-ball, only 9-ball, against Alex.
Darren Appleton has said that he will play anyone in the world in 8-ball, even, but then they will have to come to England to play. I have heard that he is working with some big games here, including Shane who has been chasing Darren for a big 8-ball match.
I would believe, but I am not sure, that Niels Feijen and Mika Immonen would play 9-ball, 10-ball, 8-ball and 14-1 even against anyone.