Also, the whole fucking point of Frodo taking the ring is that he is inconspicuous. Sauron would notice if another ringbearer had it. Gandalf doesn’t even want to hold it.
Also, Elrond helps organize the party, making the men, elves, and dwarves work together to help the hobbits. Without his influence, the men would have wanted to take the ring for themselves and Legolas would not have worked with Gimli. He and Gandalf basically tell everyone to shut up and work together.