Your are dead wrong Boston (being sarcastic)....
Jana shows up with an AK47 full of ammos and yell to other funds:
HANDS UP & GIVE ME ALL YOUR SHARES! (being funny here)
rolls eyes...
ILLOGICAL!!!!
& now
I THINK YOU ARE 1000000000000000000000000% CORRECT!
JANA is seeing Zimmer will be profitable in comings years (post si3n4 acquisition = eating into enemies' breakfast, lunch, dinner, supper).
They are being smart & get in and become a VIP (paying premium = big stakes with new shares)