We don't have anyone worthy except Lucas
Worthy? That's a rather vague term. Clearly Henderson isn't exactly the most inspirational LFC captain, but he makes more sense than Lovren, who has only just showed he is worthy of a place in the team, never mind become captain. And that's not a given, either.
As for Lucas, why on earth would he be made captain? He can't even get a game as a midfielder and is now effectively fourth-choice CB.