There were more than the Apostles in the Upper Room, yes. Yet, the promise of the Paraclete is only given to the Twelve, as is clear from John 15. Unless Christ changed His mind and no one told us, we have to assume that the Eleven and possibly Our Lady received the Holy Ghost at Pentecost, and no one else.
And so 58 of the 70 were doing what? Can you stop with everything always being "clear"? If everything were always "clear" we wouldn't be having this discussion.