The 2 fingered logo was simply made for marketing, thats all. There had to be something new and eye catching. Ghostbusters had been running game for quite some time and to be honest, i think that, the 2 fingered logo may have helped. People saw that and were like “oh cool, part 2”. I do think however that if GB3 were to be made, that going back to the original logo would be a great idea. People are familiar with it, and when they see it they will get excited to see something they loved from way back return. Also on the original logo's side is the clothing line which was just recently sold a Hot Topics.