The short version of what Ingemann said is that UKIP cares more about origins of a party than about current official policy (or at least such is my impression).
That's why they dislike parties like SD or FN but are ok with DPP or LN or the crazy Poles.
To some extent, but it's also important for you as Swede to know, that the party Swedish media tell about have not much to do with how DPP are. There are a reason that DPP's MP rarely care to talk with Swedish reporters, while they're willing to talk to most other foreign reporters.
The Swedish media doesn't talk much about DPP these days. Not sure what Danish media says that Swedish media says or why you assume your own media to be unbiased.
There isn't really a deadline though, is there? I mean, my understanding is that you can form groups and switch etc later on in the process.
And the difference described above is that the English are correct and the Germans are being silly. Apart from the fact that no one voted based on Juncker, the whole idea of the parliamentary groups having candidates make little sense. The European parliament doesn't pick the president anyway.