... writing a whitepaper is a tricky affair.... But then the next question is; will people be interested to invest in an ICO where there is only one person at the moment.
I have seen services for ICO's they write white papers and do other things. I will not tell you which one because I haven't used and you have to check first very closely before you start. Like I told you I have seen ICO's only with white paper or even without.
Byteball has one developer too and the project is very successful. There is no rule for this. You can succeed with nothing and not succeed with a working product and great team.
All this ICO's are not known in begin. The main reason behind bounty is to attract people. That is why they pay so much to bounty hunters. If your bounty campaign will be successful it means that your project attracted many people. You have to remember that bounty campaigns are really powerful and a lot of not known projects closed their ICO's with success because of them.
I wish you luck.