Multiple adversaries should be seized as a whole, like a single adversary, while against just one attacker, movements suitable for multiple adversaries are appropriate. The best way to avoid opposing the force of an attack (that is to say, to move in awase) is to imagine that several attackers are to be dealt with at the same time.
This principle permits effective extrication, moving away from lines of attack and correct positioning with respect to one’s opponents.
Moreover, to be effective, techniques have to be performed with the whole body, not simply the arms. An aikidoka must use the whole body. Each part: the arms, hips and feet need to work together when performing a technique. Before learning to “move in awase with an adversary”, one must learn to “move in awase with the parts of one’s own body” - suburi practice is there for that purpose.
Multiple attack should be seen as an ambush therefore the intent should be to move off line and mount a superior attack to allow escape.
Do NOT engage multiple attackers. Aikido tai sabaki body alignment and evasion should give you the moment to make an escape. At best you may be capable of unbalancing the first attacker and throwing him toward the other. Your main concern is to escape.
I tend to disbelieve the idea that as a martial artist you shall be able to engage multiple opponents and defeat them.