Who is next for Kovalev? Kovalev-Beterbiev the next great LHW fight?

So, realistically, who is going to fight Kovalev after he beats Ward? I'm looking through the rankings, and it looks like he will be due for a few mandatory opponents. But who is the next voluntary "big fight?" Obviously he won't give Ward a third fight, and I highly doubt Stevenson would randomly choose to fight him after ducking the biggest fight of his career in 2013. SO who is next? Joe Smith Jr? He seems to be one of the only realistic options. How would you guys feel if he voluntarily defended all his belts against Joe Smith? The options are really thin. You can scratch out Ward, Adonis (unfortunately), Gvozdyk isn't happening because of the same manager. Maybe Kovalev takes a tune up against Fonfara before fighting Beterbiev? With that said, it leads me to this: After Kovalev solidifies his spot as the P4P king, will Kovalev-Beterbiev be the next great LHW fight? AND, the even bigger question: Is that fight even possible and would Kovalev get credit for beating Beterbiev, or does Beterbiev need more work? But who could he "work" against? The painful reality is starting to hit me- after Ward, the options at LHW are going to be really thin. There isn't going to be many options for Kovalev to defend his title against, so I'm fearing that he may be in that weird spot where he's just too good for everyone, and all of his future opponents will be at such a step-down, that fans won't be satisfied no matter what. Thoughts?