Oh I would say without a doubt that IS CC.
Good call on the tool "sound" too, I hear that vibe clearly.
EDIT - HOLY SH** No it is NOT CC, I would have bet money on that one.
Here is what a quick search pulled up:
If the former members of Soundgarden wished to reunite without their original singer, Operator's Johnny Strong would likely top the list of potential candidates. At times, Strong delivers a vocal sound that is such a dead-ringer for Chris Cornell's singing style and tonality that an untrained ear would be seriously challenged to tell them apart. Joining Strong for SOULCRUSHER (the band's debut) is former Puddle Of Mudd guitarist Paul Phillips. The album grooves with emotionally driven, radio-friendly hard rock not unlike...er...Soundgarden.
Seems we all agree on the vibe anyway