It would appear that many posters believe that when betting large ML favorites it always (or often) makes sense to do so only within the context of a parlay with one or more additional large ML faves.
I'll just point out that this is wholly unnecessary.
If you like a large ML fave then just bet it. There's absolutely no value to be gained from waiting for another bet with which to parlay it (putting aside correlation, the desire to lock in a market price, proper Kelly staking, and the circumventing of limits). If at a later date, be it the next day of the next year, you like another large ML fave (and poor principles of money management don't concern you) feel free to roll over the principal and all proceeds of the first bet into the second.
That's all you're doing when betting a parlay.