I took a quick look over some of his previous posts.

If 'Dave A', or one of the site admins could please run a printout of this man's posts over the last, say, 6 months, I believe that a trend may very well emerge.

Confidence tricksters are good story-tellers who prey on victims who are in a desperate position. They will promise the earth, & drop in small one-line catch phrases, to hook into their intended victim. They appear to be totally trustworthy, on the surface.

The two hook lines I noticed were:
1. Cancer, health = I'm harmless, feel sorry for me;
2. CCDA(?), bringing in someone from Nigeria = I'm an expert & can get things done - no problem.

It would be interesting to see what other hook-lines have been used over time. This modus operadii will allow site admins to block this man under future guises...