They never finished the Tommy Riker arc. Instead of Shinkhan in Nemosis, maybe TOM RIKER could've been TEH BIG BAD EVEL in that movie instead, having allied with Romulans &/or other BIG EVEL BADDIES to get back at the UFP for "letting" the Dough min yin (as Captain Crisco pronounced it) wipe out the Marquis. With Tom Riker you already have the twin/double thing in place. THEN they could've done something GREAT like have that one Sela show up to give this great movie atmosphere.