The state of patent law is such that, when you discover that something you have developed, even if you developed it completely alone and with no outside input, resembles something that someone else has patented, it is often cheaper to license their patent (Be it through an exchange of licenses, a lump-sum payment, or royalties) than to pay the lawyers to battle it out.
As viciously as the two companies fought over T-150 and LS-8, I don't see that particular battle being to either company's advantage.