It's a popularity contest, nothing more. Tucker was a better singer than Bucky.
But, you're forgetting that there are different factions voting. You have those that vote personalities. You have those that vote based on the latest week's performance and you have those that vote based on ALL of a person's performances.
Not everyone votes based on personality and who is best on any given night is subjective. Very dependant on preferences. jmo
'night all!!