This is just my guess, but at some points of the show, they (Ebi*Masu/crews/staffs) might invite the group's predecessor to do 1 episode or 2 together (games with both EbiMasu are great, though), if.. both groups don't have any issues against each other.
But I think that would be awesome. 
Let us say, they have a special Kawaii Koshien between them...or an "invasion" from the predecessor's first Gen (imagining Rika doning the Black Muscats uniform again)...
Before Sayako score reveal and she so close Baka GTB. Can see how she disappointed . She just like " No , I can't be Baka like them ;("
And of course Airi like " I almost escape this place . I don't want to be here long
"
And the result reveal make Airi very disapointed
Not just Sayako...even Sola, Jessie, and her fellow BM sisters Rika and Zako became worried.
I
don't think it is
impossible that some Ebimasu 1 girls make an appearance on Ebimasu 2.
I won't be surprised if I see a familiar face on the set. Especially if Ebimasu 2 faces a 'Choito Muscat' situation.
But the producers decision
not to include
any Ebimasu 1 girls in the new roster sends a pretty clear message.
This is program is not a continuation of 'Onedari SP!' with a few new girls. It is a new program.
IMO, the producers will give the new program a fair chance to establish its own identity.