If Jesus could not truly be tempted, His "temptation"... wasn't really temptation! This is not a difficult concept to grasp.Your first point is not necessarily true.
Scripture clearly states that Jesus was "tempted in every way". If He could not sin, He was not truly tempted. Logically, it is impossible for a volitional entity to be tempted to do what he/she/it is simply unable to do.
Yes, and yes.For your 2nd point, aren't all saved believers now sealed with the Holy Spirit? Yet, we still sin correct?
When we get our new bodies, no, I don't think we will still choose to sin.What happened after we get our new body at the rapture/2nd coming of Christ? Do you think we will still choose to sin then?