I assume you are talking about Kampei.
The difference between a Shogun and a Regent has everything to do with heritage, and land.
Hideyoshi chose Kampei because that is the second best choice. The amount of land he own is more than enough to proclaim a Shogunate. He controlled territory from former Mori to Mino, with all the major Daimyos submitting to him.
To either the Genji clan or the Taikra clan.
Hideyoshi was not eligible to become Shogun because he had no lineage to Minamoto.
A shogu is still a daimyo even if you are kicked out of your land.
And if you have no land then you cannot be a daimyo (by definition) and you cannot be a Shogun unless you are a daimyo (unless there is some technicality I am missing). To be Shogun you also must have unified Japan(obviously I suppose).
Togukawa did not unified Japan when he became the Shogun. Few became Shogun when they unified Japan.
You also need to know Japanese titles were given randomly, distantly, and 'emptly'
A Shugo daimyo was a governor basically, and a Sengoku daimyo was basically a local warlord that evolved from a Shugo daimyo.
Oda was a Shugodai. Almost EVERYONE of the daimyo you heard of is Shugodai except for a few with very noble lineage.
A Shugodai could definitely EFFECTIVELY become a daimyo. Effectively, however, Hideyoshi was shogun but OFFICIAL he was not.
You can be both a daimyo and someone's retainer at the same time. Much like a baron is a noble while still a retainer to the king.
THe next technicality was Hideyoshi was a retainer of the Oda clan of which he was never the head of the Oda clan officially.
And he was effectively and officially the head of Oda after the death of all three sons, and the puppet grandson became the official ruler.
He was a warrior of a daimyo, but since he was not the head of the Oda clan he was not a daimyo and Harima officially was an Oda holding....and like I said he was never official the head of the Oda clan.
You honestly don't have an understanding of feudal system do you?
Either way, land can have multi tier ownership.
Hideyoshi did not even receive a family name until 1585...so he could not have been a daiymo until that point anyway, and at that point he was Regent.
Then what is Hashiba? Just because he was from a peasant family doesn't mean he didn't make a name.
I am discussing technicalities. But you are missing the technicalities.
So it all comes down to technicalities...but when you are discussing titles technicalities are everything.
Shogun could be landed or not. Daimyo could be landed or not.
We are way off topic. Can you just stop using basic general claims such as Hideyoshi didn't become Shogun because he wasn't a daimyo, etc etc. And focus on the small things.