>>>Speaking in tongues and the interpretation of that which is spoken is two different gifts.
No one person will ever have both gifts <<<
I don't think THAT conclusion is warranted. Yes, they are two different gifts, but the idea that one person cannot have both gifts is not found in the scriptures.
In fact, the scriptures say, "So anyone who speaks in tongues should pray also for the ability to interpret what has been said" (1 Corinthians 14:13)
So clearly it CAN happen that one person can both speak in tongues AND interpret as well.
But it is true perhaps that USUALLY "someone will speak in a tongue and someone else should interpret" (vs 26)
But because of what it says in verse 13, we cannot make a hard fast rule about that to say that one person NEVER has both gifts.
I have seen this in operation myself, and even I myself have both spoken in tongues and interpreted. Usually, however, I did not interpret MY OWN tongues speaking...but on a few occasions, when no Interpretation was forthcoming right away, I did.
I believe that ANY believer can operate in ANY Spiritual Gift if they are open to it, and if they follow the leading of the Spirit (Manifestation Gifts)
But at the same time, each of us in Christ has certain gifts that are with us at all times (Resident Gifts...these are my own classifications, but they are consistent with what is revealed in Scripture).