I have looked a bit more in SVAR and Arkiv Digital. The reason for not following up #1, #2 and #4 is that none of them had any good reason to be Johansson or anything remotely like it when they left home.
The other three all have fathers with Johan as one of the names, and so could have used the patronymic Johansson as a surname. Axel Emanuel could also have used his father's last name Jonsson, which is almost Johansson.
Now it turns out that Axel Otto Laurentius used his father's surname, Söder. Otto Axel Teodor used his father's surname, Kalström. Axel Otto Emanuel happened to choose to be Axel Otto Emanuel Nilsson, from his father's first name, not Johansson from his "middle name". So the chances for an Axel Otto Johansson born in 1883 aren't good.
Also, the only one of these three who left Sweden before 1910 was Otto Axel Teodor Kalström, who went to America in 1906.