Releasing captive animals, who probably won't know how to survive in the wild, is always a bad idea. When it is done it needs to be done by experts in the context of a rehabilitation programme.
So I hope they catch your last wolf and get him back in his enclosure.
However, I am a big fan of wolves and always interested to hear about (proper) re-introduction and its successes and problems.
I watched a programme about the wolves they've reintroduced to Yellowstone National Park in the States. They found some very interesting things. Firstly, wolves hunt only to eat, they do not have energy to spare to hunt for fun. They will use hunting and the prey they've caught to train the cubs to hunt, of course. Secondly, because wolves are organised and live and hunt in packs, they hunt only prey which is large enough to feed the pack. So they tend to leave alone small prey animals. In Yellowstone this has meant they tend to feed mainly on the caribou. Prior to the reintroduction of the wolves, the caribou had had no real predator and had wandered at will, drunk where and when they liked, and so on. Now they have to be more cautious as there could be wolves about, and there has been a massive increase in biodiversity at all levels throughout the Park. The caribou no longer destroy all saplings at the water's edge, so that woodland has come back down to the waterside. This has helped the beaver, who now has more trunks available for dambuilding. Beaver dams increase biodiversity up and downstream of the dams, and that in turn feeds larger animals, birds, etc.
So far I haven't heard of reintroductions where there are farmed sheep, and one would have to wonder whether the pack would find they could pick off as many sheep as they needed. And of course things could be very different when there is a lone wolf having to feed himself - he'd take smaller prey, as he's only himself to feed and no pack to help him hunt. But he would surely only take what he needs and not waste energy hunting for fun.