If TKL wants one opponent against TT and it's TCB, he wouldn't even need to meet TCB. He can just announce that he is pulling out
If TKL wants to meet TCB, the only obvious reason is he wants that one opponent against TT to be himself.
TKL seriously thinks he stands a better chance than TCB against TT? Goodness.
The strategy of the 3 men should be as follows:
For TT, to sell himself as non-PAP since he looks like the most PAP. PAP votes would mostly be solidly behind him and he may get some opposition votes.
For TCB, he should sell himself as a neutral. By default he can only get less PAP votes than TT and opposition votes are uncertain between him and TKL. Aim is to get more PAP votes and more opposition votes.
For TKL, sell both his opponents as PAP. Since he can get nearly nothing of the PAP votes, the only way is to aim to get more opposition votes than TCB.