That may well be true in some startup contexts but, more generally, capital (more typically called equity) is effectively whatever is left over after you subtract your liabilities (accounts payables, short- and long-term debt, etc.) from your assets. This number shows up on the same side of the balance sheet as liabilities.

A balance sheet doesn't really speak to who might have claims to ownership of the company under what terms and the dollar amount of equity on the balance sheet doesn't imply that investors are owed that specific dollar amount.