Please excuse my hic cup don't understand. my note is more garbled than usual.
DC Buell was "censued by the war department for not pursuing the Confederates swiftly enough to bring them into action again, and on Oct 24, 1862, was ordered to turn over his command to Gen. Rosecrans. A military committe made a report which was never published. Gen Buell was mustered out of May 23, 1864, and resigned his commission in the regular army June 1 1864."
Source: The Union Army vol. 8
I offer my opinon on the relationship and friction between Johnson and Grant. Both men were devoted Unionists but Johnson was an ardent Democrat. I think as early as '64 Grant and others saw him as heir apparent to Lincoln. He may have walked down Wilmer McLean's varanda but he was running for president. On my mind at least any friction between the two was political.