I don't speak for SDP but a keen observer, regularly following local websites, including Yap's blog postings.
I know Yap has not done anything on his own but always seen, rather gatecrashing, whenever there are high profile events organized by others.
The only event I can recall that Yap organized was his "hunger strike" in front of the Istana. For mysterious reasons he didn't even continue it for a day. Why?
There's no word from SDP about Yap. Does your "keen" in "keen observer" mean "interest/stake" or "interest/subject". That's because you seem very keen to clarify and spread the word on SDP's distancing from Yap. Not just your POV.
Why is PAP’s 154th bootlicking ST keeps referring to Yap Keng Ho as supporter of SDP when he is not?
What is the motive behind in “charging” Yap together with other SDP members and supporters?
I suppose, since the entire state machinery is under the jackboot of the octogenarian dictator, the ST, the police and the judiciary are in cahoots in planting this agent provocateur Yap to retard the activities of those wanting to change the autocracy.