T9s in the BB - proper use of the CR?

[Demos]

UTG appears to be TAG, otherwise table is unexceptional.

Party Poker 0.5/1 Hold'em (10 handed) converter

Preflop: Hero is BB with T[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, UTG+2 calls, MP1 calls, <font color="#666666">1 fold</font>, MP3 calls, CO calls, Button calls, <font color="#666666">1 fold</font>, Hero checks.

Flop: (7.50 SB) J[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(7 players)</font>
Hero checks, UTG checks, UTG+2 checks, MP1 checks, MP3 checks, CO checks, <font color="#CC3333">Button bets</font>, <font color="#CC3333">Hero raises</font>...

My line on seeing the flop:

* Don't want to bet middle pair into a large field. Will call a single bet back to me and likely fold to two unless the pot becomes ginormous.
* If first bet comes from late position, plan is to CR to try and thin the field.
* In both cases, re-evaluate on the turn.

Is my logic sound?