This satty had about 293 entrants total and the first hour people could re-enter if busted. 4k chips starting, 20min blinds, 10 handed.

We're down to 110 players still 10 handed and it's 400/800/100 i believe. I can't remember if the ante was 75 or 100 for some reason right now. Anyways, the whole table is <20bb besides 4 players including myself. Super old guy just moved to the table and opened 3/5 hands already. He's always cbet and seems to be on a heater according to him. I've rarely seen really really old guys be this aggro right when moving so i am assuming he has been catching some hands. Haven't seen any showdowns though.

It folds to me in MP+1 and I open to 1700 with K10s I have just a little bit over 23bbs so 18.8k roughly. All fold to the old guy in BB who flats (He's got about 19kish so he is covering me just barely) Flop comes 553dd bringing my FD draw. I cbet 1900 and he quickly CR's for 4200. 

 Is he the type of player to CR rip a 5x here? I don't think he would but I don't know anything about him. I feel like he would be flatting 5x..i've seen 77-JJ just CR here before and he might be doing this with those types of hands. We're basically flipping vs most pairs if we jam over him. He might fold his lower pairs since he'd be crushed and this is a big pot considering everyone is quite short. Also, he prob could have axdd but no idea if he's CRing that. What do you guys think about just ripping it on top of him here?