In the post you responded to it contained how the loan was repaid. As far as who brought the other investors in since they were the CEO's (Burns) sons I assume he brought them in and not Campagna.
"Mr. Campagna waived all payment of interest on his Notes and received warrants to purchase 15,000 shares of Common Stock at a per share
exercise price of $2.50. David, Michael and Jeffrey Burns were issued warrants to purchase an aggregate of 33,500 shares of Common Stock at a per share exercise price of $3.75. The Notes issued to the Burns were repaid in full on November 3, 1994 with interest, and the Note issued to Mr. Campagna was repaid in full on October 7, 1994. Although, under the terms of the Notes, the holders had the right to demand a late charge of 5% of the amount due, neither the Burns nor Mr. Campagna made such a demand.