Let's be generous and clean up the injection before the other plugins.

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PacketFilterManager.java

@@ -480,6 +480,12 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		
 		try {
 			manager.registerEvents(new Listener() {
+				@EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+			    public void onPrePlayerJoin(PlayerJoinEvent event) {
+					// Let's clean up the other injection first.
+					playerInjection.uninjectPlayer(event.getPlayer().getAddress());
+			    }
+				
 				@EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
 			    public void onPlayerJoin(PlayerJoinEvent event) {
 					playerInjection.injectPlayer(event.getPlayer());

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/PlayerInjectionHandler.java

@@ -326,6 +326,20 @@ public class PlayerInjectionHandler {
 		}	
 	}
 	
+	/**
+	 * Unregisters a player by the given address.
+	 * @param address - address of the player to unregister.
+	 */
+	public void uninjectPlayer(InetSocketAddress address) {
+		if (!hasClosed && address != null) {
+			PlayerInjector injector = addressLookup.get(address);
+			
+			// Clean up
+			if (injector != null)
+				uninjectPlayer(injector.getPlayer());
+		}
+	}
+	
 	/**
 	 * Send the given packet to the given reciever.
 	 * @param reciever - the player receiver.

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/PlayerInjector.java

@@ -545,10 +545,13 @@ abstract class PlayerInjector {
 	}
 	
 	/**
-	 * Set the associated player.
-	 * @param player - associated player.
+	 * Retrieve the hooked player object OR the more up-to-date player instance.
+	 * @return The hooked player, or a more up-to-date instance.
 	 */
-	public void setPlayer(Player player) {
-		this.player = player;
+	public Player getUpdatedPlayer() {
+		if (updatedPlayer != null)
+			return updatedPlayer;
+		else
+			return player;
 	}
 }

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/TemporaryPlayerFactory.java

@@ -80,7 +80,7 @@ class TemporaryPlayerFactory {
 				if (methodName.equalsIgnoreCase("getName"))
 					return "UNKNOWN[" + injector.getSocket().getRemoteSocketAddress() + "]";
 				if (methodName.equalsIgnoreCase("getPlayer"))
-					return injector.getPlayer();
+					return injector.getUpdatedPlayer();
 				if (methodName.equalsIgnoreCase("getAddress")) 
 					return injector.getSocket().getRemoteSocketAddress();
 				if (methodName.equalsIgnoreCase("getServer"))