[Rules] Who commands the SPAs?

[Poor Yorek]

A related question: in 4th ed., can a regular leader with a combat bonus, activating an SPA and a regular (towed) artillery unit (or another SPA) that are in adjacent hexes, use his combat bonus to combine the BF fire between the two (c.f. 6.41)?

6.8 and 6.83 make it clear that regular leaders can activate SPAs even though they are AFVs, but 6.8 is explicit in denying the regular leader's morale bonus to a morale check or recovery to an SPA unit. Nothing is said, however, about the use of the combat bonus. So ...

(i) since nothing is said explicitly to the contrary, does one take the normal meaning to be that a regular leader with a combat bonus can activate any mix of SPAs and regular artillery pieces in one or two (depending on the leader's bonus) adjacent hexes to combine their BF values into a single attack value or ...

(ii) infer from 6.8 that since the morale bonus of a regular leader can not be applied to an SPA, neither can the combat bonus be applied to combine them for BF (c.f. rule 6.41)?

and cry 'havoc' and let loose the Dogs of War!