Tamworths are more vocal than saddlebacks - tabatha our gilt never stops talking whilst we're around !
You should have no problems in mixing pigs of different ages, the small ones will defer to the Tamworth, and she'll see them as no threat. Just introduce in a large area (room to run away) with more than one sleeping area - they don't tend to have mixed that well enough on first night to share a bed! Otherwise with that much difference in size 9sow vs. wenaers), I wouldn't worry about either neutral ground or neutralising smell - some introduce in an area that belongs to neither and use all sorts of things from channel no. 5 to wet dung to make all the pigs smell the same -but this more applies to older sows mixing, so in your case I wouldn't worry or bother.
The little ones will nip in and out of her feet to feed, and would fully expect them all to be sleeping together by night 2 or 3.