Who is the prince in Ezekiel if not the Messiah? How could it be Jesus? He offers for sin offerings for himself. First, consider Ezekiel 42:14 we see that this is a prophecy concerning the Third Temple/Ezekiel's Temple. This is clearly telling the priests what to do.
Then in Ezekiel 44:22-23 the priests are going to teach the laws of holiness, of clean and unclean. These are laws that you believe are not required anymore.
Finally, in Ezekiel 45:22: "And the prince shall make on that day for himself and for all the people of Israel a bull for a sin-offering." "The prince" is clearly the Messiah. This is a prophecy of the Messiah. You claim that Jesus is the Messiah but why then is he offering a bull for a sin-offering in the Temple if his death atoned for all sin?