Now, Some personal notes about this queer incident.
1- This was clearly filed in criminal court, not civil court. Otherwise the police couldn't have gotten involved.
2- Arrcording to the article, SNKP realized in Summer of 2013, but they didn't file a suit until this May. That's a HUGE gap. Makes you wonder what they were doing during that period, and why.
3- Personally, I think SNKP is simply shooting themselves on their feet with this. The Japanese game market is a small industry and to file a suit like this is simply going to give make them further themselves in relation to other companies. Keep in mind that Square Enix was one of the few companies that actually did collaborations with SNKP with their "Lord Of Vermillion" arcade card game, which had cameos from KOF characters
(Link Here). Square Enix is also the parent company of Taito that sells the TypeX arcade board and also runs the Nesica arcade distribution system which SNKP's titles currently run on. There may be reasons to why SNKP decided not to settle things in the back, but to other companies, it may look like SNKP is simply not afraid to sue anyone even if it's a company with that sort of ties.
