Yes, that is correct. Jesus already conferred individual salvation upon us so that did not need to be done again....
Baha'ullah came to regenerate and save the world and all its peoples.
“Considering this most mighty enterprise, it beseemeth them that love Him to gird up the loins of their endeavor, and to fix their thoughts on whatever will ensure the victory of the cause of God, rather than commit vile and contemptible deeds. Wert thou to consider, for but a little while, the outward works and doings of Him Who is the Eternal Truth, thou wouldst fall down upon the ground, and exclaim: O Thou Who art the Lord of Lords! I testify that Thou art the Lord of all creation, and the Educator of all beings, visible and invisible. I bear witness that Thy power hath encompassed the entire universe, and that the hosts of the earth can never dismay Thee, nor can the dominion of all peoples and nations deter Thee from executing Thy purpose.
I confess that Thou hast no desire except the regeneration of the whole world, and the establishment of the unity of its peoples, and the salvation of all them that dwell therein.” Gleanings From the Writings of Bahá’u’lláh, p. 243
I am not good at science so I am the worst person to try to explain what Baha'is believe about evolution.
@Truthseeker would do a much better job of that. Suffice to say that man is more than an animal and at some time during the course of evolution man got a soul, which then differentiated man from the other animals.
As I have told you before, Adam, Noah and Abraham were never referred to as Manifestations of God by Baha'u'llah. They were referred to as prophets.
So it does not matter what Baha'is believe about that. As we all know humans often misinterpret scriptures.