Really would depend on what's between their ears. Speed of the pack that you consider on the slower side may be their comfort zone and they probably won't run as well if pulled by a faster gait ed hound. Some may try the faster pace that a quicker and snapper hound is able to pursue but they wouldn't be comfortable as they would be in their natural gait/speed. The real smart ones won't even try! Next be sure the faster hound is honest and appears to be a clean running hound instead of a faulty, reaching, front end hog that will ruin the slower hounds. Very few of the faster ones that I have seen will slow down to a slower speed on good scent just because his/her pack mates want to run in their comfort zone and would not pull up to his/her speed. Speed doesn't scare me if one has brains and nose to handle it. JMHO
James