It's sometimes difficult to interpret what the interactions between two different species of sexually mature and juvenile fish mean; particularly when housed in such small quarters. I wouldn't read too much into it as far as the 'pairing' theory is concerned either---your oscar is nowhere near reaching sexual maturity yet. Even if they were to become 'buddies,' we still don't have a clue as to the sex of your oscar---and if we did, it wouldn't matter one iota because these fish will not be able to successfully spawn with one another.
BV