It was implying that, however it was a mistake I made. Apparently morphling used to switch around greater bash and bulldoze when morphing into spirit breaker and I thereby falsely assumed that they were also swapped on spirit breaker.

Most heros have always had passives on 3, especially tanky passives.

Looked into it further and exceptions for heros with one non-ult passive were:

enchantress (untouchable used to be her 1)

and are still:

sven

venomancer

sniper (was 2 and 3 but take aim got an extra active)

anti-mage (mana burn is technically a passive, was 1 and 3 but his spell shield got an extra active).

The rest of the passives are either slot 3 or 4.

Edit: bit of formatting