I'll preface this by saying, I am not an expert...but I have recorded and mixed several VO's recently.
Thoughts as it played - unless there is a specific situation calling for it, I wouldn't add reverb. The first VO
sounded like it was in the garage and a bit distracting.
-You already mentioned the volume matching and distortion thing, but I would also try and automate the volume to level out the 'performance' as much as you can, while also minimizing the spitty sounds 'esses' lip smacks (I didnt notice lip smacks in any of these).
-Sometimes the music can be really busy and distracting, but if you are stuck with the music, then maybe more EQ'ing and lower in the mix is the way to go.
-I don't think that mic works well with his voice...or maybe a combo of the mic/voice and room...it reminds me of a cheap USB microphone going in to a boom box. Is a reflection filter available? If you are stuck with the recordings "as is" then maybe some EQ can help. I would have a redo, with a nice mic in a vocal booth/reflection filter or a decently quiet room, if he wants to be a serious venture.
I wish him well, it's a tough business to break in to