Jeremiah 41: Ishmael was not any Messiah but he wanted the power.

 In Jeremiah 41 we read:

1-3 But in the seventh month, Ishmael son of Nethaniah, son of Elishama, came. He had royal blood in his veins and had been one of the king’s high-ranking officers. He paid a visit to Gedaliah son of Ahikam at Mizpah with ten of his men. As they were eating together, Ishmael and his ten men jumped to their feet and knocked Gedaliah down and killed him, killed the man the king of Babylon had appointed governor of the land. Ishmael also killed all the Judeans who were with Gedaliah in Mizpah, as well as the Chaldean soldiers who were stationed there.

Ishmael had royal blood and had been one of the Zedekiah's (I suppose) officers beside his connection with Amon (this is a little odd, but perhaps due to some marriage among royal families).  So, Ishmael must have considered very inappropriate that Gedaliah was in power. He and ten other men went to Mizpah and met Gedaliah who offered them a meal, but he was killed there.
Ishmael intercepted a group of 80 men heading to the temple of Jerusalem, carrying grain offerings and incense. They didn't know about the murder and Ishmael invited them to meet Gedaliah. 70 men were murdered in Mizpah, but 10 other men negotiated their lives saying that they had hidden grains to give for their lives. Ishmael had thrown the body of Gedaliah in a cistern, and used the other 70 bodies to hid Gedaliah's body. Besides, Ishmael took Zedekiah's daughters that were entrusted to the care of Gedaliah.

Johanan (who wanted to kill Ishmael in order to save Gedaliah) went with an army to Mizpah. He released Ishmael prisoners, but Ishamael flew to Amon with 8 other men (2 must have been killed). However, Johanan decided to flee to Egypt in order to avoid a retaliation from Babylon. Although he was innocent, he must found difficult to explain in details the situation to Babylon.
This narrative is the reason why Jeremiah went to Egypt as we are reading in next chapters.

Did Jeremiah go to Egypt by his own initiative? Did Jeremiah have free will to choose?