Unless he asks for something directly, I'd attribute it to manipulation.
If he asks directly for a delay in the D and/or for an attempt to R, his change may be real and positive.
But he needs to address issues directly and courageously. He needs to take the risk of being rejected.
And even if he looks like really good candidate for R, you can say 'No,' and hold your head high. You don't need to give him another chance.