I don't see that at all. If there was a person named Jesus who was baptised by John, went preaching, performed healing acts, such as are non miraculous and commonplace among charismatic preachers. In those days there was no medical science to refute that demons had been expelled from sick patients. And was arrested and executed following a disturbance in the Temple. A single person could have done these things, and if there was such a person called Jesus
And that's a big IF, as there are problems with even that.
1. For example a "disturbance in the temple", much less the attack in the synoptics, and much less the ARMED attack in John, would have been dealt with on the spot by the whole cohort of armed soldiers posted there as guards to prevent exactly that kind of thing from happening. There would be no last supper or anything.
2. It would also be a noteworthy event. Josephus even writes about some random schmuck who was arrested and beaten up for prophecising against Jerusalem on the STREETS. Which was significant for Josephus since the point he repeatedly is trying to make is that the the destruction of the temple and the coming of Vespasian as the messiah were God's will and prophecized ahead of time. Also, because the Jews had altered the shape of the temple. So any crazy guy speaking cryptic prophecies against Jerusalem was been of GREAT interest to Josephus as supporting his point. A guy even speaking in the temple against what the temple had become, doubly so before passover, and doubly so one actually prophecising the destruction of the temple like in John, would have been of even greater interest to Josephus. Yet apparently he's never heard of that Jesus guy.
3. But let's even talk about WHAT would Jesus even say against the temple there. Having merchants right in front of the actual temple (it was only in the courtyard, mind you) was just how it had always worked, and because what God through Moses had demanded that the people sacrifice there. There were all sorts of animals required for various sacrifices for occasions as mundane as that the wife had her period, and a peasant couldn't be expected to haul his own goat or whatever from Bethlehem to Jerusalem each time. A Jesus who accused the Jews of not keeping the laws of Moses had no real reason to rail against people buying a fresh required sacrifice right in front of the temple, in order to stick to the Law.
And it's not a view we find represented or attributed historically to any of the Jewish groups that people try to fit Jesus in.
The view that the whole temple is a house of a god, and any public affairs had to be kept outside was in fact a Roman not a Jewish view. Mark is accepted as having written in Rome, so, yeah, we can take an educated guess that the whole thing came from Mark not from any Jew named Jesus.
4. "if there was such a person called Jesus" is actually another thing that's not clear at all. Paul for example seems to say that his messiah got the name Jesus AFTER his death and resurrection. In effect he BECAME Jesus because of his sacrifice. It's his apotheosis name. Which as I was saying, is the same name as Joshua, the guy whose return as a messiah a bunch of other guys were awaiting.
So for all we know, the guy who inspired it all could have even been called Alexander, and people only started to refer to him as the returned Jesus after his death.