I'm a solo self funded searcher, and I always refer to 'we'.

I do this to represent the group that will eventually purchase the target co. I've got a cohort of investors that I anticipate will invest in what I eventually acquire, and I wouldn't make major decisions without seeking guidance from them. So I feel quite comfortable referring to us collectively.

I've only been questioned on it once by a seller, and they seemed comfortable with the concept that 'we' referred to myself and the syndicate of investors I work with.

Good question - I was asked that question when I met a business advisor during my solo days. It felt natural to say "we" as I was starting an initiative that would involve more people and go beyond myself as a person.