Hardwick acknowledged St Kilda presents a different challenge with Rowan Marshall back from injury this week to rekindle his ruck partnership with veteran Paddy Ryder against Chol and Ryan.
Both Saints ruckmen were unavailable when Richmond defeated Brett Ratten's side by 86 points in round five.
St Kilda lost a semi-final to the Tigers last season and has come under fire after slipping out of finals contention this year with four losses in its past five outings.
"They've been bashed around a little bit in the media but we know they, at their best, can be very damaging," Hardwick said.
"We've got to be aware of how that looks.
"They've changed the way they play a little bit from last time we met them; they move the ball a little bit more round-the-world type of movement.
"But we know they're a dangerous side when they're firing on all cylinders."
https://www.richmondfc.com.au/news/964041/dimma-s-eye-to-the-future-in-ruck-battle-with-saints
