Your BahnCard 100 is only for DB trains, and their partners like regional transport associations. Not sure why you suspect it to be valid for a competitor's service. And I doubt Locomore will ever partner with DB...
That's not how it works. There's the tariff union TBNE which covers almost every train in the country. I can use non DB trains without a problem (e.g. the HKX) - just not this one (and Thalys).