In other words, if you have to know 3 facts about a domain, it doesn't have a steep learning curve; if you need to know 1000 facts it does. Time is irrelevant in this context. The correct axis should be facts to know and effectiveness to reason / act in domain.
The origin of the name Ichigo is Japanese. This is the culture in which the name originated, or in the case of a word, the language. Ichigo is the Japanese word for strawberry, but the name can also mean one/best guardian as a male name from ichi one and go guardian.. Also the Japanese word for strawberry which would be the feminine form. Ichigo iis a name in manga and anime in titles like Bleach and Tokyo Mew Mew.
He was a SUBSTITUTE soul reaper. Ichigo's SOUL became a soul reaper; that too BECAUSE OF RUKIA, not Isshin. Isshin is only responsible for his high spiritual pressure. Inside of Ichigo lives Zangetsu(Yhawach), the quincy, and white Ichigo, the hollow.