LSS and Eddie worked together before but their scenes were very little, and I'm sure they didn't hang around each other that much off-screen since she was very shy then, and Eddie's was surround by the guys. So it's understandable about the awkwardness at the press conference, just like the first conference for BBJX. It'll take time for LSS to warm up to Eddie, and I'm sure they'll get into their roles and deliver.
But yes, I agree. Would be a shame if HG and LSS didn't get to collaborate again and make good use of their chemistry. But who knows, maybe MengJu will knock everybody's socks off without even trying, just like their so-called "sibling" in CP3...LOL
***Note: This thread is already on page 50 and they haven't even started shooting yet!