When JJP are ready they'll release a game. People will want it and buy it, perhaps selling other games to fund it. No-one really "steals" another brands sale by releasing a game earlier, they might just delay it a bit. You might not buy their game straight away but you'll make room for it when you're ready. JJP marketing with that teaser was horrific tho, and their tight-lipped, zero information to customers is also pretty frustrating, but only because they have fans who want to buy their games and are excited for whatever the next release will be, GnR or TS, but these fans will buy it and all will be forgotten, until the next time!