Alive Old Hiruzen doesn't have the chakra capacity to replicate his elemental Edo feats without exhausting himself. Destroying the forest with large AoE elemental jutsu is fine, but he wouldn't be very servicesable afterwards. I don't recall anything in Chiyos arsenal being on a forrest busting scale.
Deather Reaper seals the casters soul within the Death Reaper... Chiyos restoration technique doesn't work here. How is Kiba going to get poisoned when nothing is going to pierce Kibas skin while using Gatsuuga (and it's variants). The guy drills through solid matter without sustaining any damage onto himself; so the blades should be repelled by the rotation. Even still, if anyone gets poisoned, then Shino's insects simply remove it [
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]. Shinos insects also would absorb Chiyos chakra strings, completely nulling her use of puppets altogether.
I fail to see how Lightening Pillar or Hidden Mist are doing anything in front of the Byakugan; and chakra sensors/trackers like Kiba (smell) and Shino's insects.
Yes, he does... He can actually see perfectly and maneuver throughout the entire forest; while Lee can't. Shino can simply deploy chakra absorbing insects to pester Kidomaru. And Kakashi's sharingan vision is getting hampered with the insect jamming jutsu... He isn't landing Kamui at all. Especially in a forest, where the oposition would excel in.