The rule is if you have "the majority" of the games, don't enter. Not sure how that works in a 2-game combo.

In practice, the devs pretty much let the GA creator interpret 'Majority' however they wish. Perhaps that may* change with a really extreme example (such as insisting anyone who owns a $2 content in a $100 package can't enter), so you'd probably want to contact support before posting in that kind of instance (or in any circumstance where you'd want assurance before acting), but generally you can feel confident that staff'll go along with owned-content-based reroll requests.

*Though given that staff appears to treat partial package ownership restrictions similar to puzzle filters, I'm not even sure that kind of exception would hold true. In that sense, the entire structure of the rule may just be a legacy of when it was first introduced.. 8 or more years ago, perhaps? Definitely something to run by staff, if a more clear answer is desired for those extreme examples.

However, there are some specific circumstances where GA creators may still not be allowed to reroll off the 'owned content' premise: Staff potentially won't allow a reroll in some circumstances where the content in question (either owned or unowned) can't be purchased anymore elsewhere [ie, outside of the package in question], nor will they allow for a reroll if a winner's version of a given content has a different APPID [outside of the package] than that of the equatable content inside the package.

On the other side of things, staff will allow you to make ownership judgment on previously free / bundle listed games without staff making any special consideration for their listing status- meaning that for a [previously free game + 2 dlcs] package, you could still prohibit entry for just owning the base game.