All we know is that they haven't improved it. It did start to get better at the end of last season, but "better" here is relative to the big pile of Swiss cheese they were before. So great, they went from "fucking awful" to merely "below average", and have done nothing to improve on that. As it stands, this line is still below average at-best (for those of you that can see who else is on the line instead of focusing on the "saving grace" that is Chris Williams: Frank Omiyale is garbage, Garza and Kreutz are equal amounts hot garbage and Kevin Shaffer is another question mark lineman with a good amount of years on him).
Is it possible Garza and Kreutz come back rejuvenated? Yes, however--and this might be pissing in the wind with you guys--don't make the mistake of confusing possible and probable. Can Chris Williams and Frank Omiyale come back and improve on their gap control and quickness? Again, it's possible, but given how unthinkably bad Omiyale was (and how bad Williams' knees are), there's little reason to think it probable.
So then, we have Williams at his natural position (question mark), and steaming garbage at the rest of the spots on the line...yeah, what a great time to start hoping.
And pointing out "we don't know that yet" only further illustrates your guys' levels of meatballishness, as it only takes a quick glance at last year (even the relative "improvement" we saw) and who is on the roster now to see that there is little, if anything, to hope for.