It looks like Stellar Forge Star Lord is built for........
Coliseum and coliseum only
When champion designer worked on him, it seems they had Coliseum heavily in mind?
Or there's no content for him to shine at all and Coliseum just happen to be there at around the same time
His ramp up might be too slow for Battlegrounds
And not worth using in Elder EQ
It's just purely speculation or mere coincidence that both just drop at around the same time with Coliseum dropping first and SFSL coming in later