It might seem strange that patrollers can kill Saibamen like they're just Mooks, and still need a Party to beat Raditz, even though Raditz is only slightly stronger than a Saibaman. But it should be noted that powers that are too high at that point could draw too much attention, so possibly the patrollers are only allowed to use only a fraction of their power to avoid drawing attention and affecting the story.
It may seem strange that the aliens believed that Satan killed Frieza, but: As Goku is not a person who seeks fame, the remnants of Frieza's army had no way of knowing that he was the one who defeated Frieza, so they obviously believed that the one who killed him was the most famous fighter in the world, Mister Satan.
It may seem that Mister Bii (the blind boy who was cured by Majin Buu) remembers him, but it is worth noting that the wish was for people to forget the bad memories they had about Buu, and Bii did not.
We know that the patrollers are talented, but they go a step further, when you consider that the beginning of their training and the trip to tmq 4 officially take place in the year 1,000, that is to say that the patrolmen managed to obtain the power to fight enemies of the Saiyan Saga in less than 1 year.
We know that the earth of the game is very dangerous, but to what extent is it necessary to analyze.
The original Saibaman are standard mobs with about 4k of health. This may indicate that standard mobs over 4k of health are stronger than a Saibaman. And just counting the ones that appear in the open world and on the cc floors, the number easily runs into the thousands.
Why are there so many powerful villains of non-alien origin in the game? Simple, in the year 804 Gohan wrote a book to control ki, and although Gohan sure wrote it with good intentions, there is nothing that would prevent evil earthlings from reading the book to become more powerful.
