It does have context. Those millions of years were done with constant training from a Generation 01, fighting waves and waves of enemies, being blown to pieces and murdered over and over again and resurrected to do it again and again until he was able to do it without dying at all. Imagine that over years and year and years. The Sleepwalkers use this training to constantly improve in combat in real time, and Jesus can take them on in hordes with little issue.
He can keep up with Hank evenly, someone who scares the same people with access to said training so badly that it keeps them up at night at just the thought of his existence.
He was able to fight Director Phobos, who is a confirmed Generation 01 who was able to take on Hank, Sanford, and Deimos all at the same time with no issue, with all of them having the scaling from above plus with Sanford possessing levels of tactical intuition that borders on mind-reading.
Being the greatest swordsman in history is as much of a nothing statement as you believd the millions of years of experience was.
Predicting movement of an opponent while they existed in a different flow of time is basically impossible to compare to the rest of the feats listed. It's a hyperspecific skill that wouldn't be taken into account here, ignoring the fact other characters in-universe are capable fo predicting people's movements to a point it borders on mind-reading (Sanford)