As crazy as it sounds, I actually think there's a possibility that Sullivan would actually be fine with running with Tanev and Blueger on separate lines. Sullivan has actually shown somewhat of a willingness to play Tanev in different roles outside of playing with Blueger. I think at the start of the year, he was playing with Jankowski and Tanev also had a look with Malkin too IIRC.
Doing something like Zucker-Blueger-ZAR and Tanev-4C-ERod may be an easier sell for Sullivan, because he has at least shown a willingness to separate Blueger and Tanev, unlike Blueger and ZAR.