can the squad leader allow other marines in the squad the ability to use his chapter squad abiities as it seems to read that way?

dean said:

No, that was a mistake that has been fixed in the official errata. He needs some other source (like being a Tactical Marine) to extend his Chapter abilities to the rest of the team.

As written: No.

But we do it that way, because it makes the game more interesting and means that people other than the Tactical Marines get to lead the team sometimes.