I'm in agreement with Lisa's earlier post being supportive of how the owners are running the club (live within our means, increase commercial income, generate profit through player trading, return Academy to Cat 1, etc) and I don't think they are operating with us right at the limits of the financial cap.
If they were really doing that, sacking Sheehan probably would have been impossible and we'd have been stuck with him. Any financial decision made regarding Walta was likely to ensure we do still have financial headroom in case anything unexpected happens between now and the end of the season, although I appreciate that is just a guess on my part.
I can't support the suggestion that a club should aim to spend every available penny and be right at the limit, because of unexpected developments. That's not 'good management' to me. But I don't think that's what the owners are doing, so I guess it's pretty much irrelevant.