Here is my take.
1) Wei- Overall another excellent vocal as usual. Excellent Performance. Grade A-
2) Zachariah- Didn't love the song choice to say the least. Didn't love the vocal either. Sounded like alot of screaming to me. Below Average Grade C-
3) Collin- Overall I think he did a good job on that song. A solid performance, athough thought the band was a little too loud, and did drown him out in a few parts So I agree with you there. Grade B
4) Megan-I don't like her tone which is why I wil never be a fan, but she can sing. And on that song it worked for the most part. One of her better performance. Good but not great. But for her good is great. Grade B
5) Iam- More of the same pleasant, but a bit boring and bit forgettable. Slightly Above Average for me. Grade C+
6) Wei- She was solid, but not my favorite from her, not a perfect vocal for me. But still good. Grade B
7) Zach- Better than the 1rst performance, but his 1rst performance was one of the worst in the contest for him. But far ffrom perfect, just average for me. Grade C
8) Collin- I kind of liked it. Not perfect but solid vocally, and the song just seem to connect in a way. Can't expain it, something intangible about it. Good performnce. Grade B
9) Megan-Didn't love this performance. Her tone for me it a problem. Just barely average at best for me. Grade C
10) IAM- A boring Average at best vocal. Grade C
To Me my top 3
Wei (Best singer by a country mile.)
Collin (Move into clear 2nd choice for me)
Zach (Based on past weeks performances gets him 3rd choice for me)
What Happened Wei and Zach Get cut. Strongly disagree on Wei. Slightly disagree on Zach, but this week was not good, so it did hurt him.
If you see these talent shows what you begin to realize who wins, it is either a country singer (They have absurd levels of success), or your classic Either Sob/Feel Good story. And that is clearly what advanced. That is what does well these days. Wei as good of a singer as she is (I don't think it has anything to do with the voice you mentioned), isn't a country singer, and did not have the good appealing sob story/feel good story that people seem to graviate to from a voting perspective. I will root for Collin, but who are we kidding IAM is winning this thing in a landslide I have been saying it for weeks, not that I think he should win, but all you had to do was listen to the audience the people are voting for him it really is that simple at the end of the day. All is just my opinion of course.