question

I've been a holder since 2006 and just have a few questions about the recent activity:

1. Does the fact that KAH has a 40% stake in EXT mean that potential bidders who want RS can simply try to takeover KAH, pushing their SP up, rather than EXT? I ask this question because I'm just wondering if it would be much better to invest in KAH rather EXT. Also, since the JV between KAH and EXT was scrapped, KAH's SP has increased much more than EXT.

2. If RIO does manage to control KAH and assume effective control of EXT, what would that mean for EXT holders? I tried looking it up but am not sure about what mandatory bidding/compulsory acquisition is about.

Thanks, hope the recent activity continues!